3SnSO4 + K2Cr2O7 + 20HCl → 3H2[SnCl6] + Cr2(SO4)3 + 2KCl + H2O
Tin(II) sulfate react with potassium dichromate and hydrogen chloride to produce hydrogen hexachloridostannate(IV), chromium(III) sulfate, potassium chloride and water. Hydrogen chloride - concentrated solution.