Question

Assertion :The pH of an aqueous solution of sodium acetate is more than $7$. Reason: Sodium acetate is a salt of a weak acid (acetic acid) and a strong base (NaOH). It undergoes hydrolysis in aqueous solutions.

$C{H}_{3}COONa+H_{2}O\to C{H}_{3}COOH+N{a}^{+}+O{H}^{-}$

Acetic acid is weak acid and is partially dissociated whereas NaOH is a strong base and completely dissociated.

Read the above assertion and reason and choose the correct option regarding it.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Sodium acetate is a salt of weak acid (acetic acid) and strong base (NaOH).
It undergoes hydrolysis in aqueous solution.
$C{H}_{3}COONa+H_{2}O\to C{H}_{3}COOH+N{a}^{+}+O{H}^{-}$
Acetic acid is weak acid and is partially dissociated whereas NaOH is strong base and completely dissociated.
Thus, the solution contains more number of hydroxide ions and less number of hydrogen ions. This makes solution alkaline.
Hence, the pH of an aqueous solution of sodium acetate is more than 7.