Hydrates Sentence Examples
On solution in water, heat is evolved and hydrates formed.
Davy, inspired by his successful isolation of the metals sodium and potassium by the electrolysis of their hydrates, attempted to decompose a mixture of lime and mercuric oxide by the electric current; an amalgam of calcium was obtained, but the separation of the mercury was so difficult that even Davy himself was not sure as to whether he had obtained pure metallic calcium.
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.
The alkalis are used almost exclusively in the condition of caustic lyessolutions of their respective hydrates in water.
Moisture is evolved from substances containing water of crystallization or decomposed hydrates.Advertisement
If, however, phosphoric acid is present in the original substance,we may here obtain a precipitate of the phosphates of the remaining metals, together with aluminium, chromium and ferric hydrates.
Tin and antimony (also arsenic) are converted by it (ultimately) into hydrates of their highest oxides Sn0 2, Sb205 (As 2 O 5) - the oxides of tin and antimony being insoluble in water and in the acid itself.
Dumas, who regarded them as hydrates of olefiant gas (ethylene); on the other they yielded chloroform, chloral and aldehyde, as well as other compounds of less general interest, and also the method of forming mirrors by depositing silver from a slightly ammoniacal solution by acet aldehyde.
In modern chemistry alkali is a general term used for compounds which have the property of neutralizing acids, and is applied more particularly to the highly soluble hydrates of sodium and potassium and of the three rarer "alkali metals," caesium, rubidium and lithium, also to aqueous ammonia.
In a smaller degree these alkaline properties are shared by the less soluble hydrates of the "metals of the alkaline earths," calcium, barium and strontium, and by thallium hydrate.Advertisement
His analytical skill enabled him to demonstrate the inaccuracy of the researches by which Berthollet attempted to support the opposite view, and to show among other things that some of the compounds which Berthollet treated as oxides were in reality hydrates containing chemically combined water, and the upshot was that by 1808 he had fully vindicated his position.
Both these hydrates occur in the mineral kingdom, the former as natron and the latter as thermonatrite.
Both these soluble hydrates are readily coagulated by traces of a salt, acid or alkali; Crum's hydrate does not combine with dye-stuffs, neither is it soluble in excess of acid, while Graham's compound readily forms lakes, and readily dissolves when coagulated in acids.
Under all these three conditions the diamond is associated with fragments of the rocks of the country and the minerals derived from them, 'especially quartz, hornstone, jasper, the polymorphous oxide of titanium (rutile, anatase and brookite), oxides and hydrates of iron (magnetite, ilmenite, haematite, limonite), oxide of tin, iron pyrites, tourmaline, garnet, xenotime, monazite, kyanite, diaspore, sphene, topaz, and several phosphates, and also gold.
Nickel sulphate, NiSO 4, is obtained anhydrous as a yellow powder when any of its hydrates are heated.Advertisement
It combines with water, forming the hydrates SbC1 5 -1-1 2 0 and SbC1 3.4H 2 O; it also combines with phosphorus oxychloride, hydrocyanic acid, and cyanogen chloride.
Such substances are silver nitrate (lunar caustic), the caustic alkalis (potassium and sodium hydrates), zinc chloride, an acid solution of mercuric nitrate, and pure carbolic acid.
Other hydrates have also been described.
Not the least interesting part of this inquiry was the discovery of certain definite salts with alcohol analogous to hydrates, to which the name of alcoholates was given.
Twice as much carbon is stored in gas hydrates as in all known deposits of fossil fuels.Advertisement
It is very deliquescent, and readily dissolves in water, forming a brown or yellow solution, from which several hydrates may be separated (see Solution).
Sulfuric acid hydrates and salts relevant to the atmosphere.
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Part of Clennell's presentation included the suggestion that eruptions of these methane hydrates could actually reduce the density of ocean water enough to sink entire ships.
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Berzelius's investigation of the action of the electric current on salts clearly demonstrated the invaluable assistance that electrolysis could render to the isolator of elements; and the adoption of this method by Sir Humphry Davy for the analysis of the hydrates of the metals of the alkalis and alkaline earths, and the results which he thus achieved, established its potency.
It forms hydrates containing one, two, five, six and seven molecules of water.
It forms several hydrates, the medicinal value of which was recognized in very remote times.
Other hydrates are known.
If phosphoric acid is absent, aluminium, chromium and ferric hydrates are precipitated.
It forms crystallizable salts with potassium and calcium hydrates, and functions as a weak acid forming salts named plumbates.
Various hydrates have been described, but they cannot be formed by precipitating a uranyl salt with an alkali, this reagent giving rise to salts termed uranates.