Fe2(SO4)3 + K2SO4 + 24H2O → 2{KFe(SO4)2•12H2O}
Iron(III) sulfate react with potassium sulfate and water to produce dodekahydrate iron(III)-potassium sulfate. Iron(III) sulfate and potassium sulfate - concentrated solutions. This reaction takes place at a temperature near 0°C.