Potassium Platinonitrite, K₂Pt(NO₂)₄

Potassium Platinonitrite, K₂Pt(NO₂)₄, which may be prepare by adding potassium nitrite to a solution of potassium chlor-platinite in the requisite proportions. Upon cooling the salt separates out in colourless monoclinic crystals which are anhydrous. Upon recrystallisa tion from pure water, the dihydrate, K₂Pt(NO₂)₄.2H₂O, is obtained in rhombic crystals.