A laboratory guide to the study of qualitative analysis

 
9781236326584: A laboratory guide to the study of qualitative analysis
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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. 1901 Excerpt: ...sulfid is passed through an acid solution of arsenic acid, the first effect is to reduce the arsenic acid to arsenious acid; water, and finely divided molecular or free sulfur being formed; and the arsenious sulfid is then precipitated. Under exceptional circumstances, arsenic sulfid may be obtained 286. Marsh's Test.--In the presence of nascent hydrogen, arsenic compounds yield arsin, AsH3, an extremely poisonous gas, which is easily decomposed by heat, though not as easily as stibin. If arsin be passed into silver nitrate solution, metallic silver is precipitated, and arsenious acid is produced. This latter may be detected, after adding hydrochloric acid and filtering off the silver chlorid and silver, by passing into the solution hydrogen sulfid, when the formation of a yellow precipitate of arsenic sulfid shows the presence of arsenious acid. 287. Reinsch's Test.--If a piece of bright copper foil is placed in a solution of arsenic slightly acidified with hydrochloric acid, and the solution be boiled for some time, arsenic will be deposited upon the copper as a gray coating of copper arsenid. If the copper be removed from the solution, washed and dried at a low temperature on a piece of filter paper, and then heated in a small glass tube closed at one end, octahedral crystals of arsenious oxid will appear upon the cooler portions of the tube. Gold. 288. Gold has a yellow color, is insoluble in any single acid, but dissolves in chlorin water and in aqua regia. 289. Gold forms a number of ions, among which are the + + + +. aurous, Au, the auric, Au, the chloraurate, AuCl4 the aurate, Au02, the thioaurite, AuS, and the thioaurate, AuS2 ions. 290. The auric ion forms nearly insoluble compounds with sulfur and with hydroxyl ions. 291. When the sulfur ion is b...

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