To a solution containing equimolar mixture of sodium acetate and acetic acid, some more amount of sodium acetate solution is adde. The pH of mixture solution.

Options

A. increases with increase in temperature
B. decreases with rise in temperature
C. remains unchanged
D. unpredictable

Answer

C

Explanation

A solution containing equimolar mixture of sodium acetate and acetic acid is a buffer solution. Adding to it, small amount of a solution of sodium acetate (a salt of weak acid and strong basic ) which is slightly basic in nature, won't change its pH.