chloroplatinic acid

noun

a red-brown, crystalline, water-soluble solid, H 2 PtCl 6 ⋅6H 2 O, used chiefly in platinizing glass, metals, and ceramic ware.

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The salt must therefore be derived from an acid, chloroplatinic acid, H2PtCl6, and have the formula Na2PtCl6, the ions being Na and PtCl6”, 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.