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Water Pollution

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Question

What happens when HCl gas is passed through saturated NaCl solution

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Solution

NaCl in water ionises reversibly as,

NaCl <------> Na⁺ + Cl^-

After adding HCl the conc. of Cl^-ions increases and due to common ion effect leads to precipitation of NaCl.
This process is used to purify NaCl.

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