A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 337
insufficient quantity of potash-lye (4*5 to 5 mols.), added in small portions
somewhat rapidly. At 150°, it loses 3 mols. of water, and when more strongly
heated, it explodes, giving off gases which consist mainly of nitrogen but contain
also free oxygen. When treated with ammonia, it gives up two atoms of chlorine.
It is acted on by oxalic acid in the same manner as the tetrachloride, the carbon
dioxide evolved corresponding with a loss of 3 atoms of oxygen from each molecule.
After the reaction the liquid contains a black precipitate, which gives off
ammonia when heated with soda. When gently heated in hydrogen, the trichlorocompound
undergoes violent decomposition, yielding water, ammonia, and free
nitrogen.
The third member of the series platinum fulminodichloride, Pt4N4Cl2O12H22,
is formed on heating ammonium chloroplatinate with aq. potash-lye, added in
moderate quantities until the liquid remains slightly alkaline and ceases to evolve
ammonia. It is a fine yellow body, closely resembling the compound last described
in most of its reactions. It is completely decomposed by treatment with zinc and
sulphuric acid, the platinum being thrown down in a finely-divided metallic state,
whilst the whole of the chlorine goes into solution. Sulphur dioxide passes into
water in which the compound is suspended, gradually dissolves it, forming a nearly
colourless solution, which when neutralized with sodium carbonate and evaporated
yields crystals of the salt, 2PtSO3.6Na2SO3^H2O.
The fourth member of the series, platinum fulminochloride, Pt4N4Cl(OH)O12H22,
is obtained as a dark yellow powder by heating ammonium chloroplatinate with
4-7 mols. of potash-lye added at once, until ammonia is no longer evolved. It
loses 4 mols. of water at 152°. When gradually heated to 260° with sodium carbonate,
nearly the whole of the hydrogen is oxidized to water, whilst the nitrogen
is for the most part set free. It is not appreciably acted on by oxalic acid. With
nascent hydrogen, it behaves like the dichloro-compound—vide supra.
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