H[AuCl4] + 3K2SO3 + 3KOH → K3[Au(SO3)2] + K2SO4 + 4KCl + 2H2O
Hydrogen tetrachloridoaurate(III) react with potassium sulfit and e potassium hydroxide to produce disulfitoaurate(I) potassium, potassium sulfate, potassium chloride and water. Potassium sulfite - concentrated solution.