Before revision: CaCl2 + Na2CO3 → CaCO3 + 2NaClMgSO4 + Na2CO3 → MgCO3 + Na2SO4 Distillation and rain water Since Ca2+ and Mg2+ exist as nonvolatile salts, they can be removed by distilling the water.
After revision: Distillation and rain water Since Ca2+ and Mg2+ exist as nonvolatile salts, they can be removed by distilling the water.