Question

$pH$ of $0.1M$ acetic acid is:

• A. less than 1
• B. greater than 1
• C. 1
• D. 7

Answer 1

Answer: (B)

greater than 1

$pH=-log\left[H^{+}\right]$

Acetic acid is a weak acid, hence does not dissociate completely.

So a solution of $0.1M$ acetic acid will have a concentration of free $H^{+}$ ions, less than $0.1M$.

Therefore, the $pH$ is greater than 1 (the $pH$ would be 1 for a strong acid).

Option B is correct.