Items related to Notes on the Metal; Being a Second Series of Chemical...
Synopsis
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.1868 Excerpt: ... As'" (see p. 148), and a red-brown with salts of AsT (see p. 149). For delicate testing an ammonio-sulphate of copper and an ammonio-nitrate of silver are used to test for arsenic. They are formed by precipitating either normal salt with solution of ammonia, and adding ammonia until the precipitate is nearly dissolved. The clear solution is used as a test. The solution of As to be tested must be free from any excess of H salt. Marstis Test.--By arseniuretted hydrogen (see p. 151, and also antimoniuretted hydrogen, p. 144). Rein8ch,8 Test.--When bright Cu is boiled with free HCl, the copper remains bright, the HCl having no action on it (see p. 130). But if a solution containing As be boiled with Cu as above, the As is precipitated in the form of a dark grey film of metal on the bright Cu. If such coated copper be carefully dried and heated in a narrow glass tube open at both ends and held in a slanting position, the As oxidises to As203, and condenses, forming a ring of white octahedral crystals in the cold part of the tube. A similar action takes place with Sb, but the oxide of Sb formed is less volatile, and amorphous. (See p. 145.) Group D.--Noble Metals. Five metals will be treated of in this group, namely:--There are also four other metals generally associated together in the ores of platinum; they belong to this group, but are neither plentiful nor very useful, namely:--Rhodium Iridium Osmium I Ruthenium NOBLE METALS. MERCURY. 153 There is little family relationship between the metals of this group beyond the fact that in the air they do not tarnish or oxidise; the oxides of the first five are reduced to the metallic state by heat alone, on which account they have received the name of noble metals. They do not decompose water under any circumstances,...
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- PublisherGeneral Books LLC
- Publication date2012
- ISBN 10 1235794164
- ISBN 13 9781235794162
- BindingPaperback
- LanguageEnglish
- Number of pages68
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