What is the underlying chemical reason that is purified by passing gas through its saturated solutio — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

The massive influx of $Cl^-$ from $HCl$ dramatically increases the Ionic Product of $Na^+$ and $Cl^-$. Since $Q_{sp} > K_{sp}$ for $NaCl$, it precipitates, leaving highly soluble impurities behind.