Ca(OH)2 + 2HCl => CaCl2 + 2H2O
2NaBr + CaSO4 => Na2SO4 + CaBr2
Fe(OH)3 + 3NaCl => FeCl3 + 3NaOH
6KOH + Fe2(SO4)3 => 2Fe(OH)3 + 3K2SO4
