Question

In a mixture of acetic acid and sodium acetate, the ratio of concentrations of the salt to the acid is increased ten times. Then the $pH$ of the solution:

• A. Increases by one
• B. Decreases by one
• C. Decreases ten fold
• D. Increases ten fold

Answer 1

The correct option is A Increases by one

$pH=p{K}_a+\log \frac{\left[Conjugatebase\right]}{\left[Acid\right]}$

If $\frac{\left[Conjugatebase\right]}{\left[Acid\right]}$ increases by $10$ times then $pH=p{K}_a+1$