This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...In order to determine the tin electrolytically in such cases, Bongartz and Classen, B. d. Ch. Ges., 21, 2900. the sodium sulphide must be converted into ammonium sulphide. To accomplish this, the solution is treated with about-25 gm. pure ammonium sulphate free from iron, and heated very carefully, with, the dish ... Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...In order to determine the tin electrolytically in such cases, Bongartz and Classen, B. d. Ch. Ges., 21, 2900. the sodium sulphide must be converted into ammonium sulphide. To accomplish this, the solution is treated with about-25 gm. pure ammonium sulphate free from iron, and heated very carefully, with, the dish covered, till the hydrogen sulphide has all escaped; the solution is then kept in gentle ebullition for about fifteen minutes. Complete conversion into ammonium sulphide is shown by the greenish yellow color of the solution. If the heating is continued too long, tin sulphide may separate; it can be dissolved in ammonium sulphide. After it is completely cooled, any sodium sulphate that may have separated is dissolved by addition of water, and the solution electrolyzed with a current of 9-10 cc. oxyhydrogen gas per minute. The determination of the tin is much more simply and easily accomplished by converting the solution of tin sulphide in sodium sulphide into the acid oxalate. This conversion may be accomplished in two ways: either the sulpho-salt is decomposed with dilute snlphuric acid to remove the greater part of the sulphur as hydrogen sulphide, and the separated tin sulphide oxidized with hydrogen peroxide f until the stannic acid which is produced appears clear white, or the heated alkaline solution is treated directly with hydrogen peroxide (of which a great quantity is needed), then acidified with sulphuric acid to precipitate stannic acid, neutralized with ammonia, and treated with more hydrogen peroxide. In either case the solution is heated to decompose the excess of hydrogen peroxide, and the stannic acid allowed to settle and then filtered off. The precipitate is washed from the filter with the oxalate solution into a beaker, the filte... Read Less
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