3K2[PdCl4] + 6HCl + 2HNO3 → 3K2[PdCl6] + 2NO + 4H2O
Potassium tetrachloridopaladate(II) react with hydrogen chloride and nitric acid to produce potassium hexachloridopalladate(IV), nitric oxide and water. Hydrogen chloride and nitric acid - concentrated solutions.