Volume 2

The elements of experimental chemistry / by William Henry.

  • Henry, William, 1774-1836.
Date:
1815
Catalogue details

Licence: Public Domain Mark

Credit: The elements of experimental chemistry / by William Henry. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    composed, and sulphurous acid is formed. The insolubility of lead in sulphuric acid occasions its being employed as the material for consti'ucting the chambers, in which that acid is prepared, and even for boiling down the weak acid. Sul- phate of lead, however, may be formed, either by adding sulphuric acid, or still better sulphate of soda, to any of the salts of lead. Its insolubility renders its formation of use as a step in mineral analyses, and hence it is necessary to know its exact composition, which is stated by Berzelius as fol- lows:— Sulphuric acid 26.34;.. ... .100. Yellow oxide 73.66 279. 100. 379. If the whole oxygen in the sulphate of lead be supposed to be divided into four parts, one of these, it is remarked, by Berzelius, is combined with the lead, and three with the sul- phur. In the sulphite, one third of the oxygen is united with the lead, and two thirds with the sulphur. IV. Nitric acid, a little diluted, dissolves lead, with the extrication of nitrous gas. If the acid be in small quantity, a sub-nitrate is formed, which becomes soluble on adding more acid. A small portion remains undissolved, which Dr. Thomson finds to be oxide of antimony with a httle silex. The solution is not decomposed when poured into water. By evaporation, it yields large regular crystals, which are soluble in about 7^ parts of boiling water. They contain no water of crystallization, and consist, according to Berzelius, of Nitric acid 32.78 100 Yellow oxide 67.22 209.5 100. 309.5 Chevreul considers this salt as a super-nitrate*, and ♦ 1 Thomson's Annals, 101.