Standard Methods of Chemical Analysis a Manual of Analytical Methods And Genera

Wilfred W Wilfred Welday Scott

The book Standard Methods of Chemical Analysis a Manual of Analytical Methods And Genera was written by author Wilfred W Wilfred Welday Scott Here you can read free online of Standard Methods of Chemical Analysis a Manual of Analytical Methods And Genera book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Standard Methods of Chemical Analysis a Manual of Analytical Methods And Genera a good or bad book?

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190. 9 ; sp. Gr. 22 A ; m. P. 3700 C. ? oxides OsO, Os 2 O 3, OsO 2, OsO 4 .
DETECTION Osmium occurs with platinum ores and alloyed with iridium. The chlorides, OsCli and OsCl 4, combine with the alkali chlorides. Osmium oxidizes easily and burns in the flame. Through the action of HN0 3, aqua regia or heating in a stream of moist chlorine, osmic tetroxide is formed. Osmium is very volatile and the fumes are poisonous. It is detected readily by the odor when heated, as the fumes are highly corr...osive and disagreeable like chlorine. Chlorine passed over hot osmium mixed with KC1 gives K 2 OsCl 6, which dissolves in cold water.
338 PLATINUM GROUP Hydrogen sulphide precipitates brownish black osmium sulphide, OsS 4, but only in the presence of some strong mineral acid. It is insoluble in ammonium sulphide.
Potassium hydroxide precipitates reddish-brown osmium hydroxide.
Ammonium hydroxide precipitates the osmium hydroxide.
Zinc and formic acid precipitate black metallic osmium.
Hydrogen reduces osmium compounds to the metal.

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