2HgCl2 + H[SnCl3] + HCl → Hg2Cl2 + H2[SnCl6]
Mercury(II) chloride react with hydrogen trichloridostannate(II) and hydrogen chloride to produce mercury(I) chloride and hydrogen hexachloridostannate(IV). Hydrogen trichloridostannate(II) - diluted solution. Hydrogen chloride - concentrated solution.