How can you purify NaCl by common ion effect?

How can you purify NaCl by common ion effect?
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Answer :

The impurities present in the common salt are CaCl2 MgCl2 and Na2SO4 in it. These impurities can be removed by common Ion effect. For this purpose a saturated solution of NaCl is prepared. Then HCl gas is passed through it. HCl is stronger electrolyte than NaCl Ionization of NaCl is suppressed by passing HCl gas and it is precipitated out.
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