Hydrated sentence example
Several hydrated forms are known, yielding salts known as columbates.
How much water do we need to drink to be fully hydrated?
The anhydrous chloride is formed by heating strontium or its monoxide in chlorine, or by heating the hydrated chloride in a current of hydrochloric acid gas.
A hydrated form is prepared when a solution of titanic acid in hydrochloric acid is digested with copper, or when the trichloride is precipitated with alkalis.
The hydrated acid crystallizes in prisms which effloresce in air, and are readily soluble in water.Advertisement
A hydrated dioxide, approximating in composition to SrO 2.8H 2 O, is formed as a crystalline precipitate when hydrogen peroxide is added to an aqueous solution of strontium hydroxide.
Hydrated sulphates occur at several localities in the province of Madrid and in other provinces of Spain, and at Miihlingen in Aargau, and copious deposits of glauberite, the double sulphate of sodium and calcium, are met with in the salt-mines of Villarrubia in Spain, at Stassfurt, and in the province of Tarapaca, Chile, &c. A native nitrate of soda is obtained in great abundance in the district of Atacama and the province of Tarapaca, and is imported into Europe in enormous quantities as cubic nitre for the preparation of saltpetre.
Several hydrated forms of aluminium oxide are known.
One of Martha's Bird Song chores had been keeping the struggling plant hydrated.
On evaporating this solution the hydrated salt CoI 2.6H 2 0 is obtained in hexagonal prisms. It behaves in an analogous manner to CoBr 2.6H 2 0 on heating.Advertisement
The anhydrous salt may be prepared by heating a saturated solution of the hydrated salt.
For the manufacture of Epsom salts and for other hydrated magnesium sulphates see Magnesium.
The process goes on until a relatively small quantity of water has by instalments dissolved and hydrated the 2CaSO 4 H 2 O, and has deposited CaSO 4.2H 2 O in felted crystals forming a solid mass well cemented together.
The hydrated form, found native as the mineral manganite, is produced by the spontaneous oxidation of manganous h y droxide.
It is almost impossible to prepare a pure hydrated manganese dioxide owing to the readiness with which it loses oxygen, leaving residues of the type xMnO yMn0 2.Advertisement
The hydrated chloride, MnCl2.4H2O, is obtained in rose-red crystals by dissolving the metal or its carbonate in aqueous hydrochloric acid and concentrating the solution.
Manganese may be estimated quantitatively by precipitation as carbonate, this salt being then converted into the oxide, Mn 3 0 4 by ignition; or by precipitation as hydrated dioxide by means of ammonia and bromine water, followed by ignition to NIn 3 0 4.
By suspending the precipitated cerous hydroxide in water and passing chlorine through the solution, a hydrated form of the dioxide, 2CeO 2.3H 2 O, is obtained, which is readily soluble in nitric and sulphuric acids, forming ceric salts, and in hydrochloric acid, where it forms cerous chloride, with liberation of chlorine.
A higher hydrated oxide, CeO 3 xH 2 O, is formed by the interaction of cerous sulphate with sodium acetate and hydrogen peroxide (Lecoq de Boisbaudran, Comptes rendus, 1885, loo, p. 605).
A hydrated chloride of composition 2CeC1 3.15H 2 O is also known, and is obtained when a solution of cerous oxide in hydrochloric acid is evaporated over sulphuric acid.Advertisement
Many hydrated forms of the sulphate are known, as are also double salts of the sulphate with potassium, sodium, ammonium, thallium and cadmium sulphates.
Bleaching-powder is a compound obtained by the action of free chlorine on hydrated lime, containing a slight excess of water at ordinary temperatures or slightly above these.
In recent years it has been found in considerable quantities in New Caledonia in the form of a hydrated silicate of nickel and magnesia approximating to the constitution (NiO, MgO) SiO 2 .
A hydrated form, Ni 3 0 4 ..2H 2 O, is obtained when the monoxide is fused with sodium peroxide at a red heat and the fused mass extracted with water.
In the anhydrous state they are usually of a yellow colour, whilst in the hydrated condition they are green.Advertisement
Three hydrated forms are known, viz.
Two hydrated forms have been described, one containing three molecules of water and the other half a molecule.
A crystalline form was obtained by Debray as olive-green prisms by igniting a mixture of sodium tungstate and carbonate in a current of hydrochloric acid gas, and by Nordenskjold by heating hydrated tungstic acid with borax.
A hydrated cuprous oxide, (4Cu 2 O, H 2 0), is obtained as a bright yellow powder, when cuprous chloride is treated with potash or soda.
Several hydrated oxides, e.g.Advertisement
The salts derived from cupric oxide are generally white when anhydrous, but blue or green when hydrated.
Cupric chloride, CuC1 2, is obtained by burning copper in an excess of chlorine, or by heating the hydrated chloride, obtained by dissolving the metal or cupric oxide in an excess of hydrochloric acid.
It is a brown deliquescent powder, which rapidly forms the green hydrated salt CuC1 21 2H 2 0 on exposure.
Several basic salts are known, some of which occur as minerals; of these, we may mention brochantite, CuS04, 3Cu (OH 2), langite, CuSO 4, 3Cu(OH) 2, H 2 O, lyellite (or devilline), warringtonite; woodwardite and enysite are hydrated copperaluminium sulphates, connellite is a basic copper chlorosulphate, and spangolite is a basic copper aluminium chlorosulphate.
Of these we may notice libethenite, Cu 2 (OH)PO 4; chalcosiderite, a basic copper iron phosphate; torbernite, a copper uranyl phosphate; andrewsite, a hydrated copper iron phosphate; and henwoodite, a hydrated copper aluminium phosphate.Advertisement
Normal cupric carbonate, CuCO 3, has not been definitely obtained, basic hydrated forms being formed when an alkaline carbonate is added to a cupric salt.
A saturated solution of the hydroxide deposits on cooling a hydrated form Ba(OH) 2.8H 2 0, as colourless quadratic prisms, which on exposure to air lose seven molecules of water of crystallization.
Upon removing the material from the vessel and exposing it to the atmosphere the sulphide of iron undergoes a revivifying process, the oxygen of the air displacing the sulphur from the sulphide as free sulphur, and with moisture converting the iron into hydrated oxide of iron.
It oxidizes on exposure with considerable evolution of heat; it rapidly absorbs carbon dioxide; and readily dissolves in acids to form ferrous salts, which are usually white when anhydrous, but greenish when hydrated.
Ferric oxide or iron sesquioxide, Fe203, constitutes the valuable ores red haematite and specular iron; the minerals brown haematite or limonite, and gothite and also iron rust are hydrated forms. It is obtained as a steel-grey crystalline powder by igniting the oxide or any ferric salt containing a volatile acid.Advertisement
Red ferric hydroxide dissolves in acids to form a well-defined series of salts, the ferric salts, also obtained by oxidizing ferrous salts; they are usually colourless when anhydrous, but yellow or brown when hydrated.
Ferri hydroxidum (U.S.P.), the hydrated oxide of iron, made by precipitating ferric sulphate with ammonia, is used solely as an antidote in arsenical poisoning.
The addition of ammonia to this solution precipitates a brown hydrated oxide.
Ammonium metavanadate is obtained when the hydrated vanadium pentoxide is dissolved in excess of ammonia and the solution concentrated.
Sodium chromate, Na 2 CrO 4.10H20, forms pale yellow crystals isomorphous with hydrated sodium sulphate, Na2S04.10H20.Advertisement
Some clays, however, such as fireclays, contain very little potash or soda, while they are rich in alumina; and it is a fair inference that hydrated aluminous silicates, such as kaolin, are well represented in these rocks.
The third sample contained a major hydrated component that could be isolated in pure form by high-performance liquid chromatography.
Your skin is velvet, hydrated, left with a natural refined elegance.
This is oxidized in air with a catalyst to form ethylene oxide, which is then hydrated to produce ethylene glycol.
It sets out how to prevent heatstroke with practical ways of staying cool and hydrated.Advertisement
Water is important to help keep the skin hydrated.
All of us should aim to drink at least 2 liters of fluid a day to keep our bodies fully hydrated.
Treatment Keep the patient well hydrated, ie give plenty to drink.
Children need to be adequately hydrated during all school lessons in order to maximize their learning potential.
The greatest effect is due to the most strongly hydrated anions.
A useful guide to checking whether you are properly hydrated is to look at the color of your urine.
The patient should be well hydrated prior to the study.
Group may be used for this job, and the first step is to prepare a PDB file for the hydrated ion.
I am on the trail of Hydrated lime too.
This valuable combination of marine plants rich in minerals & enzymes will leave the skin deeply nourished & hydrated.
Other ingredients might include set retardants such as hydrated lime, and fiber reinforcements such as straw and ox hair.
For example a major class of IDPs and all of the carbon rich chondrites contain hydrated silicates.
Copperas is hydrated ferrous sulfate, also known as green vitriol.
Hydrated sulphates of composition CoS04.6H20, CoSO 4.4H 2 O and CoS04 H 2 0 are also, known.
Haemosiderin, an iron-containing pigment (probably an hydrated ferrous oxide), is found in more or less loose combination with protein substances in an amorphous form as brownish or black granules.
Calcium sulphate, CaSO 4, constitutes the minerals anhydrite (q.v.), and, in the hydrated form, selenite, gypsum (q.v.), alabaster (q.v.), and also the adhesive plaster of Paris (see Cement).
Sodium sulphate, Na2S04, known in the hydrated condition (with ioH 2 O) as Glauber's salt, is manufactured in large quantities for conversion into the carbonate or soda (see Alkali Manufacture).
In the circulating fluid bed (CFB) dry scrubber process, hydrated lime is injected directly in the CFB reactor.
That way I keep hydrated and do n't get tempted to indulge in cans of coke.
A snapshot of a hydrated vermiculite clay, in which the clay layer spacing is 4nm.
Water Bottle Holder - Keep hydrated during your workout by using the convenient water bottle holder.
The relative effect of the ions is the reverse of the Hofmeister series just given with weakly hydrated ions binding best, i.e.
You will also want to monitor your baby's diapers to ensure that your child is hydrated and eliminating effectively.
It’s also important to stay hydrated and because the mall is so expansive, comfortable walking shoes are a must.
Once your pet is located, take them to the vet to make sure they're healthy and hydrated.
You should also be sure you drink plenty of water to stay hydrated and to help thin mucus.
Dry skin doesn't hold onto the color as well as moisturized skin does, so for best spray tan results, always make sure your body's well hydrated from the inside and out.
Dry skin types require rich, comforting ingredients that infuse the skin with moisture and keep it hydrated.
Skin should be washed, dried and hydrated with a daytime moisturizer, preferably one containing an SPF.
Before you get started dappling in color, make sure the surface of your skin is properly hydrated and covered to create the same look as Rhianna's flawless complexion.
Rhianna has gorgeous skin, so to emulate Rhianna's makeup, it's most important that your skin is clean, hydrated and supple.
Once skin has been properly hydrated, it's time to even out the skin tone and provide flawless coverage.
You want your skin to be well hydrated before applying foundation.
The popular remover lifts off heavy makeup without smudges or scratches and leaves skin feeling hydrated and smooth.
While lip gloss application needs no directive, it is important to start with a well hydrated lip to avoid chapped or rough patches.
Fresh watermelon or oranges are also a good source of fluids to help your body stay properly hydrated.
Stay hydrated, take warm clothing, wear your helmet and have fun!
Stay hydrated by drinking plenty of water, juice or a sports drinks.
Make sure you are well rested, well hydrated, and relaxed for the day of your session.
Stay well hydrated before and during your celebration by drinking plenty of water.
The manufacturers claim that these satin pillowcases reduce hair breakage and leave both skin and hair hydrated and feeling supple since there's no abrasion or skin moisture loss caused by other pillowcase fabrics.
While on the river cruise, staying properly hydrated is essential, as is eating nutritious meals - the perfect opportunity to sample authentic Costa Rican cuisine and learn even more about this intriguing nation.
Mix about 1/3 part of compost, 1/3 part organic soil, and 1/3 part hydrated coir.
Stay warm, alert, and hydrated until help arrives.
Finally, keep yourself hydrated and stop if you feel any discomfort.
Stay hydrated - Be sure to drink plenty of fluids throughout the day to avoid nighttime dehydration.
By cutting back (or cutting these things out of your day completely) and making sure you stay hydrated with plenty of water, fruits, and vegetables, you can make your lenses more comfortable.
For this reason, it's very important to stay hydrated.
Stay hydrated by visiting the water fountains located around the park.
Even though the park may not be large, sunscreen is still recommended, particularly for the water park, and guests need to be sure to remain hydrated.
Because the summer heat in Texas can be extreme, guests should stay hydrated and cool as much as possible and avoid riding the roller coasters if they feel dizzy, weak, or otherwise ill.
Be prepared for summer humidity and heat by wearing plenty of sunscreen, staying hydrated, and pacing strenuous activities.
Riders should stay hydrated while waiting for their chance to ride, and be patient and polite both with other guests as well as park employees.
Keep hydrated; being dehydrated leaves the body unable to produce body heat.
It's important to stay hydrated throughout your trip, and you can't be certain that potable water will be available every where you go.
Because of difficulty swallowing, the most important challenge is to keep the patient fed and hydrated.
It is important for the child to stay hydrated and nourished during a bout of gastroenteritis.
Fruits and vegetables can contain up to 95 percent water, so a well-balanced diet is a good way to stay hydrated.
Symptoms can be relieved with bed rest and by keeping well hydrated.
Apply a leave-in conditioner to the hair every one to two weeks to keep the hair hydrated.
If you have dry or damaged hair, apply a natural oil, such as Argan oil to damp hair after washing, to keep hair smooth and hydrated and keep layers from looking wayward and damaged.
As long as you keep your curls well hydrated, their shape and luster are sure to become one of your better assets.
Care for curly hair with caution and make sure you keep your locks as hydrated as possible for sexy spring up and shine, regardless of the season or style.
Your doctor will let you know whether or not you are keeping properly hydrated at each of your follow up visits.
To keep yourself hydrated and prevent pregnancy-related constipation, you will want to aim to drink six to eight glasses of water each day.
Keeping your skin hydrated is also important, so always bring a bottle of water with you to the pool, the beach, or wherever else those summer days may lead.
It also can help to fade brown spots and increase the skin's moisture barrier so skin cells appear plumper and more hydrated.
Vitamin E is an antioxidant that also keeps skin hydrated, which can encourage healthy hair growth.
Lotion helps to keep your skin properly hydrated, which can reduce the appearance of wrinkles and other minor imperfections.
During time abroad, stay hydrated and reduce your caffeine and alcohol intake.
It's imperative that practitioners drink at least 16 oz. of water before a Bikram yoga session, stay hydrated throughout the routine with the same amount, and consume another 16 oz. or more afterward.
Drink plenty of water before, during, and after the workout to keep the body properly hydrated.
It is also important to stay hydrated and drink enough water during a workout; dehydrated muscles will build up toxins that can lead to pain and injury.
Additionally, the consumption of water throughout your day helps fill you up, keeps you hydrated and makes you forget about food unless you really are hungry.
Your body functions best when properly hydrated, and water fills you up nicely especially when combined with fiber-rich foods.
Fluid intake - Keeping your body hydrated is essential for metabolic processes.
Aquafull - These water-insert packets are a great way to get hydrated and keep full between meals.
Staying hydrated helps the body remove excess ketones in the blood.
Make sure you are drinking water throughout the day to stay hydrated.
It's important to stay hydrated especially when you are working out and reducing calories.
More than anything, ensuring that you are adequately hydrated can help stave off hunger.
Drink plenty of water while working out to stay hydrated and alert.
Many serious joggers like to carry belts with a series of small water bottles to stay hydrated in the summer.
Researchers also note that muscle cells grow faster when they're well hydrated.
Drinking water will help you stay hydrated and thus avoid bloating.
You might also want to keep a bottle of water nearby to stay hydrated during your exercise routine.
Stay hydrated during exercise by drinking plenty of water as you work out.
Have plenty of water and cool drinks available to keep guests hydrated.
Use fresh flowers with short stems, and make sure there are plastic water tubes on each stem to keep the flowers hydrated.
However, using a light, non-greasy moisturizer formulated for your skin type will keep your skin hydrated while preventing future breakouts.
It is designed to leave skin feeling clean and hydrated.
Rich Moisture is a daily lotion designed to keep normal to dry skin hydrated.
Until the sunburn has healed, stay out of the sun and drink plenty of water to stay hydrated, since dehydration is frequently a by-product of a sunburn.
Your skin should be free from acne-causing oil, but should still be hydrated.
Staying moisturized, hydrated, and exfoliated will allow you to stave off the flakes and redness that sometimes accompany the colder months.
You should also start using an oil-free moisturizer to keep skin hydrated without aggravating or clogging your pores.
You can keep your baby hydrated with a variety of fluids and protect their skin from distressing sunburns by applying a specially formulated sunscreen.
Dehydration. As we age, many of us forget to stay hydrated.
Stay hydrated, wear a sun hat and limit your exposure to smoke and other free radicals.
Eat plenty of nutrient-dense vegetables, and drink enough water to stay hydrated throughout the day.
Not only does it help shield the skin from harmful ultraviolet rays, it keeps the skin continually hydrated and helps eliminate the appearance of fine lines and wrinkles.
Chances are you already know how beneficial water is to your body, but not everyone is aware that an amply hydrated body can impart a dewy, soft and flawless complexion.
A properly hydrated body can help prevent fine lines, wrinkles, and dry skin, so drink up and reap the reward!
Drink plenty of water to keep your body hydrated and to help your skin to absorb your moisturizer.
It helps the skin to retain about 25 percent more moisture, which in turn keeps it well hydrated.
There is no specific treatment plan for roseola; most doctors focus on keeping the temperature down and keeping the child hydrated.
Iridium tetrachloride, IrC1 41 is obtained by dissolving the finely divided metal in aqua regia; by dissolving the hydroxide in hydrochloric acid; and by digesting the hydrated sesquichloride with nitric acid.
The soluble salts are, when in the hydrated condition, also red, but in the anhydrous condition are blue.
It dissolves easily in water, forming the hydrated chloride, CoC12.6H20, which may also be prepared by dissolving the hydroxide or carbonate in hydrochloric acid.
Cadmium sulphate, CdSO 4, is known in several hydrated forms; being deposited, on spontaneous evaporation of a concentrated aqueous solution, in the form of large monosymmetric crystals of composition 3CdSO 4.8H 2 O, whilst a boiling saturated solution, to which concentrated sulphuric acid has been added, deposits crystals of composition CdSO 4 4H 2 0.
Several hydrated forms of the oxide are known, and a colloidal variety may be obtained by the dialysis of a strong hydrochloric acid solution of sodium molybdate.
Gay-Lussac in 181q, is usually obtained in the form of its barium salt by suspending freshly precipitated hydrated manganese dioxide in water and passing sulphur dioxide into the mixture until all is dissolved; the barium salt is then precipitated by the careful addition of barium hydroxide.
Being less hydrated than malachite it is itself liable to alteration into this mineral, and pseudomorphs of malachite after azurite are not uncommon.
When substances readily combine with water to form hydrates, the heat of solution in water is usually positive; when, on the other hand, they do not readily form hydrates, or when they are already hydrated, the heat of solution is usually negative.
Its property of absorbing large proportions of water, up to 80%, and yet present the appearance of a hard solid body, makes the material a basis for the hydrated soaps, smooth and marbled, in which water, sulphate of soda, and other alkaline solutions, soluble silicates, fuller's earth, starch, &c. play an important and bulky part.
An oxide of composition Ru 4 0 9 is obtained as a black hydrated powder when the peroxide is heated with water for some time.
A hydrated oxide, 2PbO H 2 O, is obtained when a solution of the monoxide in potash is treated with carbon dioxide.
The precipitate, after having been collected and washed, is digested with a warm concentrated solution of ammonium carbonate, which dissolves the uranium as a yellow solution of ammonium uranate, while the hydrated oxide of iron, the alumina, &c., remain.
A hydrated tin trioxide, Sn03, was obtained by Spring by adding barium dioxide to a solution of stannous chloride and hydrochloric acid; the solution is dialysed, and the colloidal solution is evaporated to form a white mass of 2Sn03 H20.
This salt is also formed by dissolving tin in strong hydrochloric acid and allowing it to crystallize, and is industrially prepared by passing sufficiently hydrated hydrochloric acid gas over granulated tin contained in stoneware bottles and evaporating the concentrated solution produced in tin basins over granulated tin.
Stannic Fluoride, SnF 4, is obtained in solution by dissolving hydrated stannic oxide in hydrofluoric acid; it forms a characteristic series of salts, the stannofluorides, M 2 SnF 6, isomorphous with the silico-, titano-, germanoand zirconofluorides.
The solution on evaporation deposits a hydrated form, H 2 SiF 6.2H 2 O, which decomposes when heated.
The term clay is often used by chemists to denote hydrated silicate of alumina (Al 2 O 3 2SiO 2.2H 2 O), of which kaolin or china clay is a fairly pure form.
The pure salt is dissolved in hot water and decomposed with ammonia to produce a slightly ammoniacal hydrated oxide; this, when ignited in platinum, leaves pure TiO 2 in the form of brownish lumps, the specific gravity of which varies from 3.9 to 4.25, according to the temperature at which it was kept in igniting.
The ordinary hydrated variety forms quadratic crystals and behaves as a strong base.
The hydrated carbonate, bismutite, is of less importance; it occurs in Cornwall, Bolivia, Arizona and elsewhere.
A hydrated disulphide, B12S2.2H20, is obtained by passing sulphuretted hydrogen into a solution of bismuth nitrate and stannous chloride.
It is insoluble in acids and exists in several hydrated forms. The osmiates, corresponding to the unknown trioxide 0503, are red or green coloured salts; the solutions are only stable in the presence of excess of caustic alkali; on boiling an aqueous solution of the potassium salt it decomposes readily, forming a black precipitate of osmic acid, H20s04.
A hydrated form of composition OsC1 3.3H 2 0 has been described.
Periodic Acid, H10 4.2H 2 0, is only known in the hydrated form.
Chromous oxide, CrO, is unknown in the free state, but in the hydrated condition as Cr04H 2 0 or Cr(OH) 2 it may be prepared by precipitating chromous chloride by a solution of potassium hydroxide in air-free water.
Other hydrated oxides such as Cr 2 0 3.2H 2 0 have also been described.
Werner, four hydrated chromium chlorides exist, namely the green and violet salts, CrC1 3.6H 2 O, a hydrate, CrC1 3.10H 2 O and one CrC1 3.4H 2 0.
The hydrated fluoride, CrF3.9H20, obtained by adding ammonium fluoride to cold chromic sulphate solution, is sparingly soluble in water, and is decomposed by heat.
The hydrated salt loses water on heating, and partially decomposes into hydrochloric acid and magnesium oxychlorides.
The metallic borates are generally obtained in the hydrated condition, and with the exception of those of the alkali metals, are insoluble in water.
It attacks most metals readily, usually with production of a nitrate or hydrated oxide of the metal and one or other of the oxides of nitrogen, or occasionally with the production of ammonium salts; magnesium, however, liberates hydrogen from the very dilute acid.
The hydrated lime, after being passed through a fine screen to sort out any lumps unaffected by the water, is ready for concrete making, and if not required at once should be stored in a dry place.
Bauxite is a hydrated oxide of aluminium of the ideal composition, Al 2 0 3.2H 2 0.
The solution of sodium aluminate, containing aluminium oxide and sodium oxide in the molecular proportion of 6 to 1, is next agitated for thirty-six hours with a small quantity of hydrated alumina previously obtained, which causes the liquor to decompose, and some 70% of the aluminium hydroxide to be thrown down.
To purify the oxide, it is dissolved in dilute hydrochloric acid until the acid is neatly neutralized, the solution is cooled, filtered, and baryta water is added until a faint permanent white precipitate of hydrated barium peroxide appears; the solution is now filtered, and a concentrated solution of baryta water is added to the filtrate, when a crystalline precipitate of hydrated barium peroxide, Ba0 2 8 H 2 0, is thrown down.
Other authors have sought the origin of the diamond in the action of the hydrated magnesian silicates on hydrocarbons derived from bituminous schists, or in the decomposition of metallic carbides.
By evaporation of a solution of lanthanum oxide in hydrochloric acid to the consistency of a syrup, and allowing the solution to stand, large colourless crystals of a hydrated chloride of the composition 2LaC1 3.15H 2 O are obtained.
This goes on till a density of 1.1315 is attained, when hydrated calcium sulphate begins to deposit, and continues till specific gravity 1.2646 is reached.
The simplest of all pozzuolanic cements would be a mixture of pure lime and hydrated silica, but though the latter is prepared artificially for various purposes, it is too expensive to be used as a cement material.
Celite is little affected by water, and has but small influence on the setting; alite is decomposed and hydrated, this action constituting the main part of the setting of Portland cement.
Hydrated monoCalcium calcium silicate.
Hydrated tricalcium aluminate.
In a few minutes the surplus hydrated calcium sulphate is deposited from the solution, and the water is capable again of dissolving 2CaS04 H 2 O, which in turn is fully hydrated and deposited as CaS04.2H20.
Pertantalic acid, HTaO 4, is obtained in the hydrated form as a white precipitate by adding sulphuric acid to potassium pertantalate, K 3 Ta0 5.
It is found in the form of oxide (silica), either anhydrous or hydrated as quartz, flint, sand, chalcedony, tridymite, opal, &c., but occurs chiefly in the form of silicates of aluminium, magnesium, iron, and the alkali and alkaline earth metals, forming the chief constituent of various clays, soils and rocks.