The salt must therefore be derived from an acid, chloroplatinic acid, H 2 PtC1 6, and have the formula Na 2 PtC1 6, the ions being Na and PtCls", for if it were a double salt it would decompose as a mixture of sodium chloride and platinum chloride and both metals would go to the cathode.
The mother liquors are concentrated, and the double salt of composition 2KF CbOF 3 H 2 O, which separates, is decomposed by sulphuric acid, or by continued boiling with water (C. Marignac; see also G.
On concentration the double salt separates as hexagonal tables.
Its composition approaches the formula CaOC1 2, and it is regarded as a double salt of calcium chloride and hypochlorite, which by the action of water splits up into a mixture of these salts.
A double salt of the oxyfluoride, viz.
Sandmeyer, Ber., 1887, 20, p. 1494) by the action of copper powder on the double salt formed by the addition of potassium mercuric nitrite to diazonium nitrites; and by the oxidation of primary aromatic amines (E.
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