2RuO4 + 4KCl + 14HCl → K4[Ru2Cl10O] + 4Cl2 + 7H2O
Ruthenium(VIII) oxide react with potassium chloride and hydrogen chloride to produce potassium oxodecachloridodiruthenate(IV), chlorine and water. Potassium chloride and hydrogen chloride - concentrated solutions.