A Comprehensive Treatise on Inorganic and Theoretical Chemistry

240 INORGANIC AND THEORETICAL. CHEMISTRY
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§ 18. Intermediate Oxides
According to S. M. Jorgensen, 1 platinosic oxide, or platinum tritatetroxide,
Pt3O4, is obtained by heating 1 part of anhydrous sodium chloroplatinite with
4 parts of dry sodium carbonate, until the mixture begins to fuse. The chloroplatinites
of potassium and ammonium cannot be substituted for the sodium salt.
The black residue which remains after treating the fused mass with water, and
with dil. nitric acid, is repeatedly washed by decantation with hot nitric acid,
and finally with water acidified with nitric acid, and is then dried at 110°. This
oxide is converted into platinum black by formic acid ; it is not attacked by
mineral acids, not even by boiling aqua regia. It slowly loses oxygen at a red-heat,
but it is rapidly reduced in an atm. of hydrogen or coal-gas, even at the ordinary
temp. Ju. Wohler's observations with this product showed that it is a mixture of
platinum monoxide and dioxide, which may by chance approximate to the composition
of the assumed Pt3O4. According to E. Prost, the enneahydrate,
Pt3O4- 0 JI2O, is formed as an intermediate stage in the hydrolysis of a soln. of the
nitrate, Pt(N03)2.3Pt02.5H20, which when treated with water yields yellow
Pt02.3H20 ; and the filtrate with more water yields Pt8O4^H2O/ Boiling water
converts the original salt into Pt5O11-HH2O, which is considered to be a mixture