Sodium chloride : It is generally obtained by evaporation of sea water by sun light. However NaCl so obtained contains impurities like CaSO4, CaCl2 and MgCl2 which makes the salt deliquescent. It is then purified by allowing HCl gas to pass through the impure saturated solution of NaCl. The concentration of Cl- ions increases and as a result pure NaCl gets precipitated due to common ion effect.
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