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The principles of chemistry (v. 2)


The principles of chemistry (v. 2)

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    Available in PDF Format | The principles of chemistry (v. 2).pdf | Unknown
    Dmitry Ivanovich Mendeleyev
Excerpt from book: above, and which contains 2B,O3 to Na.,O.j This salt is prepared by the action of boric acid on a solution of sodium carbonate. As borax may be perfectly purified by crystallisation, it is employed as a means for obtaining pure boric acid. If a saturated and hot solution of borax be mixed with strong earth, by which means a certain amount of the water is evaporated and a fresh quantity of boric acid absorbed: the same process is repeated in another reservoir, and so on until Fig. 8i.—Extraction of boric acid in Tn.x-anY. the water has collected a somewhat considerable amount of boric acid. The solution is drawn from the last reservoir A into settling vessels B D, and then into a series of vessels a, It, c. Iu these vessels, which are made of lead, the solution is also evaporated by the vapours escaping from the earth, and attains a density of 10 and 11 Baume. It is allowed to settle in the vessel c, in which it cools and crystallises, yielding inot quite pure) crystalline boric acid. b A solution of borax, Na,2B,O7, has an alkaline reaction, decomposes ammonia salts with the liberation of ammonia (Bolley), absorbs carbonic anhydride like an alkali, dissolves iodine like an alkali (Georgiewitsch), and seems to be decomposed by water. Thus Rose showed that strong solutions of borax give a precipitate of silver borate with silver nitrate, whilst dilute solutions precipitate silver oxides, like an alkali. Georgiewitsch even supposes (1S8W) boric anhydride to be entirely void of acid properties, for all acids, on acting on a mixture of solutions of potassium iodide and iodote, evolve iodine, but boric acid does not do this. With dilute solutions of sodium hydroxide Berthelot obtained a development of heat equal to 11j thousand calories per equivalent of alkali (40 grams ...  
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