Platinic arsenate

Platinic Arsenate has been obtained 4 as red crystals by treating a solution of the hydroxyarsenide, Pt(OH)As, in aqua regia with potassium chloroplatinate. It was described by Thomson5 as a pale brown precipitate obtained by double decomposition of sodium arsenate and platinic nitrate. 

The solution obtained by method (a), or the material obtained by method (6) or (c), is treated by one of the methods described on p. 329 et seq. to convert the arsenic present to the oxide, and then the Gutzeit method is used. It is simpler, however, to treat the solution from (a), or an alcoholic extract of the materials from (6), or (c) directly in the Gutzeit apparatus with zinc and sulphuric acid, in presence of copper sulphate or better a few drops of platinic chloride solution. 

PLATIN (German) (7440-06-4) Powdered form is a highly reactive catalyst, and may cause fire and explosions on contact with many substances, including oxidizers, acetone, strong acids, finely divided aluminum, dioxygen difluoride, ethyl alcohol, hydrazine, hydrogen peroxide, lithium, methyl hydroperoxide, nitrosyl chloride, ozonides, peroxymonosulfu-ric acid, red phosphorus. Incompatible with ammonia, arsenic, chlorine dioxide, hydrogen, methyl hydroperoxide, selenium, tellurium, vanadium dichloride. 

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