Question

Acetic acid is less acidic in sodium acetate solution than in $NaCl$ solution. If true write 1, else write 0.

Answer 1

Acetic acid is less acidic in sodium acetate solution than in NaCl solution due to common ion effect of acetate ion.

Adding a common ion prevents the weak acid or weak base from ionizing as much as it would without the added common ion. The common ion effect suppresses the ionization of a weak acid by adding more of an ion that is a product of this equilibrium.