If acetic acid is mixed with sodium acetate then $H^{+}$ ion concentration will be:

increased

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decreased

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remains unchanged

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pH decreased

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Solution

The correct option is B decreased
${C H}_{3} C O O H ⇌ {C H}_{3} C O O O^{-} + H^{+}$
On adding ${C H}_{3} C O O O N a$ due to common ion $[H^{+}]$ decreases.

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