The iridium is then precipitated from the solution (as oxide) by the addition of baryta, dissolved in aqua regia, and precipitated as iridium ammonium chloride by the addition of ammonium chloride.
The barium and magnesium salts of this acid are formed when baryta and magnesia are fused with cobalt sesquioxide.
When warmed with baryta water it gives uvitic acid.
Phys., 1888 (6) 14, p. 435); by heating phenol carboxylic acids with baryta; and, in small quantities by the oxidation of benzene with hydrogen peroxide or nascent ozone (A.
Pechmann, Ber., 18 9 5, 28, p. 857); by distilling anisic acid (paramethoxy benzoic acid) with baryta or by boiling phenyl diazonium chloride with methyl alcohol.
4 The following are the symbols employed by Dalton: which represent in order, hydrogen, nitrogen, carbon, oxygen, phosphorus, sulphur, magnesia, lime, soda, potash, strontia, baryta, mercury; iron, zinc, copper, lead, silver, platinum, and gold were represented by circles enclosing the initial letter of the element.
2 3, p. 2 377) investigated the condensation of pyroracemic acid, CH 3 CO 000H, with various aliphatic aldehydes, and obtained from two molecules of the acid and one of the aldehyde in the presence of baryta water alkylic isophthalic acids: with acetaldehyde [1.3.51-methylisophthalic acid or uvitic acid, C 6 H 3 CH 3 (000H) 2, was obtained, with propionic aldehyde [1.3.
OH COOH,when acetoneoxalic ester, CH 3 CO CH 2 CO CO CO 2 C 2 H 5, is boiled with baryta (Ber., 1889, 22, p. 3271).
Many diketo compounds suffer condensation between two molecules to form hydrobenzene derivatives; thus a, 7 -di-acetoglutaric ester, C 2 H S O 2 C(CH 3 CO) CH CH 2 CH(CO CH 3)CO 2 C 2 H 5, yields a methylketohexamethylene,whiles-acetobutyric ester,CH 3 CO (CH2)2C02C2N5, is converted into dihydroresorcinol or m-diketohexamethylene by sodium ethylate; this last reaction is reversed by baryta (see Decompositions of Benzene Ring).
Which with baryta gave chloroform and maleic acid.
Vorlander (Ber., 1895, 28, p. 2348) it is converted into y-acetobutyric acid, CH 3 C0 (CH 2) 3 000H, when heated with baryta to 150-160°.
Willstatter (Ber., 1900, 33, p. 1164) obtained this acid by the action of a methyl alcoholic solution of ammonia on dibrompropylmalonic ester at 140° C., the diamide formed being then hydrolysed either by hydrochloric acid or baryta water: CH 2 CBr(C02H) 2 CH 2.
Hydrolysis with baryta water gives acetic and salicylic acids.
It is remarkable that even a small addition of zinc-white (oxide of zinc) to the reddish varieties especially causes a considerable diminution in the intensity of the colour, while dilution with artificial precipitated sulphate of lime ("annalin") or sulphate of baryta ("blanc fix") acts pretty much as one would expect.
Boiling with dilute mineral acids, or baryta water, decomposes albumins into carbon dioxide, ammonia and fatty aminoand other acids.
Baryta and lime yield saccharates, e.g.
Fischer, by the action of baryta water, obtained the synthetic sugars aand 0-acrdse (Berichte, 1889, 22, p. 360).
Dumas obtained barium methyl carbonate by the action of carbon dioxide on baryta dissolved in methyl alcohol (Ann., 1840, 35, p. 283).
They are neutral to litmus and do not combine with dilute acids or bases; strong bases, such as lime and baryta, yield saccharates, whilst, under certain conditions, acids and acid anhydrides may yield esters.
Fischer showed that methose was identical with the a-acrose obtained by himself and Tafel in 1887 by decomposing acrolein dibromide with baryta, and subsequently prepared by oxidizing glycerin with bromine in alkaline solution, and treating the product with dilute alkali at o°.
- The only possible biose is glycollic aldehyde, CHO.CH20H, obtained impure by Fischer from bromacetaldehyde and baryta water, and crystalline by Fenton by heating dihydroxymaleic acid with water to 60°.
Like glucose it gives saccharates with lime, baryta and strontia.
This water cannot be entirely removed by fractional distillation, and to prepare anhydrous or "absolute" alcohol the commercial product must be allowed to stand over some dehydrating agent, such as caustic lime, baryta, anhydrous copper sulphate, &c., and then distilled.
Caesium hydroxide, Cs(OH) 2, obtained by the decomposition of the sulphate with baryta water,is a greyish-white deliquescent solid,which melts at a red heat and absorbs carbon dioxide rapidly.
It may be readily recognized by the white precipitate which it forms when passed through lime or baryta water.
The analysis of manganese dioxide in 1774 led him to the discovery of chlorine and baryta; to the description of various salts of manganese itself, including the manganates and permanganates, and to the explanation of its action in colouring and decolourizing glass.
Zinc and hydrochloric acid in the cold convert it into alloxantin, hydroxylamine gives nitroso-barbituric acid, C 4 H 2 N 2 0 3: NOH, baryta water gives alloxanic acid, C 4 H 4 N 2 0 5, hot dilute nitric acid oxidizes it to parabanic acid, hot potassium hydroxide solution hydrolyses it to urea and mesoxalic acid and zinc and hot hydrochloric acid convert it into dialuric acid, C4H4N204.
Barium cyanide, Ba(NC) 2, prepared by the action of potassium cyanide on baryta, or by passing air over a heated mixture of barium carbonate and coal, is a white solid, which when heated with water to 300° C. loses the whole of its nitrogen in the form of ammonia.
When boiled with caustic baryta it gives methylamine.
In his widely used method for the quantitative determination of carbonic acid the gaseous mixture is shaken up with baryta or lime water of known strength and the change in alkalinity ascertained by means of oxalic acid.
They may also be prepared by the decomposition of ketone chlorides with water; by the oxidation of the tertiary hydroxyacids; by the hydrolysis of the ketonic acids or their esters with dilute alkalis or baryta water (see Aceto-Acetic Ester); by the hydrolysis of alkyl derivatives of acetone dicarboxylic acid, HO 2 C CH 2 CO CHR CO 2 H; and by the action of the Grignard reagent on nitriles (E.
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.
Chem., 1892, 6, p. 650) prepared a more concentrated solution from the commercial product, by the addition of a io% solution of alcohol and baryta water.
Hydrolysis with hydrochloric acid or baryta water gives tropic acid and tropine; on the other hand, by boiling equimolecular quantities of these substances with dilute hydrochloric acid, atropine is reformed.
MESOXALIC ACID (dioxymalonic acid), (HO 2 C) 2 C(OH) 2 or C3H406, is obtained by hydrolysis of alloxan with baryta water (J.
Thallous hydroxide, T10H, is most conveniently prepared by decomposing the solution of the sulphate with baryta water.
Baryta water hydrolyses it to carbon dioxide, ammonia and urea.
The metals, which by combination with oxygen became oxides, were antimony, silver, arsenic, bismuth, cobalt, copper, tin, iron, manganese, mercury, molybdenum, nickel, gold, platinum, lead, tungsten and zinc; and the "simple earthy salifiable substances" were lime, baryta, magnesia, alumina and silica.
Baryta water hydrolyses it to urea.
The front lens is made of baryta light flint glass 3.
2N102, by heating the monoxide with anhydrous baryta in the electric furnace (E.
Rubidium hydroxide, RbOH, is a colourless solid which is formed by the action of rubidium on water, or by the addition of baryta water to a solution of rubidium sulphate.
When warmed with baryta water it yields succinamic acid, H02C CH2 CH2 CONH21 and with alcoholic ammonia at 100° C. it gives succinamide.
Davy tried to electrolyse baryta, but was unsuccessful; later attempts were made by him using barium chloride in the presence of mercury.
The solution, known as baryta-water, finds an extensive application in practical chemistry, being used in gas-analysis for the determination of the amount of carbon dioxide in the atmosphere; and also being used in organic chemistry as a hydrolysing agent for the decomposition of complex ureides and substituted aceto-acetic esters, while E.
Barium bromide is prepared by saturating baryta-water or by decomposing barium carbonate with hydrobromic acid.
It crystallizes in monoclinic prisms of composition Ba(C10 3) 2 H 2 O, and begins to decompose on being heated to 250° C. Barium iodate, Ba(103)2, is obtained by the action of excess of iodic acid on hot caustic baryta solution or by adding sodium iodate to barium chloride solution.
Sodium amalgam reduces it to dihydroresorcin, which when heated to 150-160° C. with concentrated baryta solution gives y-acetylbutyric acid (D.
With baryta it yields methylamine, and when heated with concentrated hydrochloric acid to 260° C. it yields methyl chloride and nicotinic acid.
Any sulphuric acid present is removed by baryta water, the precipitated barium sulphate filtered off, the solution acidified by hydrochloric acid and reduced by sulphur dioxide.