2K2[Pt(NO2)4] + 4H2SO4 → K2[Pt2(H2O)2(SO4)4] + 2NO + 4HNO2 + 2KNO2
Potassium tetranitroplatinate(II) dihydrate react with sulfuric acid to produce potassium tetrasulfatodiaquadiplatinate(III), nitric oxide, nitrous acid and potassium nitrite. Sulfuric acid - diluted solution. This reaction takes place at a temperature of <10°C.