First slide

Common ion effect

Question

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

Easy

A

Increased
B

Decreased
C

Remains unchanged
D

pH decreased

Solution

${CH}_{3} COOH ⇌ {CH}_{3} {COO}^{-} + H^{+}$
On adding ${CH}_{3} COONa, [H^{+}]$ decreases due to common ion effect of ${CH}_{3} {COO}^{-}$

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