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Potassium Iridi-nitrite, K3Ir(NO2)6

Potassium Iridi-nitrite, K3Ir(NO2)6, which is conveniently prepared by adding sodium nitrite to a hot acidulated solution of sodium chlor-iridite until it is bleached. The solution is boiled to expel nitrous oxides, and potassium chloride is added in excess, whereupon iridium potassium nitrite is precipitated as a white mass.

It is also formed by adding potassium nitrite to a solution of iridium sulphate in the warm. It is a white powder, which readily dissolves in boiling water, but which is insoluble in potassium chloride solution.

At 300° C. it begins to decompose, whilst at 440° C. decomposition is rapid. Heated in vacuo at this latter temperature, nitrogen and nitric oxide are liberated, a greenish black powder remaining behind. This, on treatment with water, leaves after a time a heavy black powder consisting of 6IrO2.K2O, which, it is suggested is probably the salt of the hypothetical hexiridous acid, (IrO)6O5(OH)2 or 6IrO(OH)2 - 5H2O. When the double nitrite is heated to redness in a muffle, the residue on thorough washing has the composition 12IrO2.K2O, which Joly and Leidie suggest may be the potassium salt of the hypothetical dodeca-iridous acid, (IrO)2O11(OH)2 or 12IrO(OH)2 - 11H2O. It is very doubtful, however, if we are justified in assuming that these are separate chemical entities.

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