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Ammonium Chlor-platinate, (NH4)2PtCl6

Ammonium Chlor-platinate, (NH4)2PtCl6, is closely similar in appearance to the potassium salt, with which it is isomorphous. It crystallises in regular octahedra.

The solubility of ammonium chlor-platinate in water at various temperatures is as follows:

Temperature ° C.15.5100
Grams (NH4)2PtCl6 per 100 grams H2O0.6661.25

When heated, ammonium chlor-platinate decomposes in accordance with the equation:

3(NH4)2PtCl6 = 3Pt + 16HCl + 2NH4Cl + 2N2,

the metal being left behind as a dull grey, soft and porous mass known as spongy platinum or platinum sponge. The density of the salt is 3.034.

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