Platinum is a kind of transition metals, density is big, can be extended, colour and lustre is silvery white, metallic luster, hardness is 4-4.5, the relative density of 21.45. High melting point is 1773 ℃. Rich ductility, can pull very thin platinum wire, rolling into a thin platinum foil. Chemical properties of stability, not soluble in strong acid, alkali, not oxidized in the air. But the following material can dissolve platinum:
Aqua regia (nitric acid and hydrochloric acid in the mixture of 1:3 (volume)
Although wang can dissolve platinum, but it is associated with the status of platinum, the density of platinum aqua regia dissolving speed is very slow at room temperature, platinum wire 1 mm in diameter to 4-5 hours can be completely dissolved. Platinum black powder (platinum) that can react with sulfuric acid when heated to generate Pt (SO4) 2, SO2 and water. Method of producing chloroplatinic acid is the platinum dissolved in aqua regia. The product of this reaction is H2PtCl6, rather than previously thought, nitrogen platinum compounds. Chloroplatinic acid is a reddish brown solid, the solution obtained from evaporation.
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From:Chemical Reagent
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