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(B) Purification of $NaCl$ by the passage of $HCl$ gas through a saturated solution of $NaCl$ (brine) is based on the common ion effect.$HCl$ is a str

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Common ion effect

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(B) Purification of $NaCl$ by the passage of $HCl$ gas through a saturated solution of $NaCl$ (brine) is based on the common ion effect.$HCl$ is a strong electrolyte that dissociates completely to provide $Cl^-$ ions.$NaCl \rightleftharpoons Na^+ + Cl^-$$HCl \rightarrow H^+ + Cl^-$Since $Cl^-$ ions are common to both,the concentration of $Cl^-$ increases,which shifts the equilibrium of $NaCl$ dissociation to the left,causing $NaCl$ to precipitate out.

Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on

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