Fe2(SO4)3 + H[SnCl3] + 3HCl → 2FeSO4 + H2[SnCl6] + H2SO4
Iron(III) sulfate react with hydrogen trichloridostannate(II) and hydrogen chloride to produce iron(II) sulfate, hydrogen hexachloridostannate(IV) and sulfuric acid. Hydrogen chloride - concentrated solution.