Question

When strong base $\left(NaOH\right)$ is added to the weak acid (acetic acid, ${CH}_{3}COOH$), then dissociation of acetic acid increases; this effect is known as:

• A. Common ion effect
• B. Reverse ion effect
• C. Saltation effect
• D. Solubility effect

Answer 1

The correct option is B Reverse ion effect

$C{H}_{3}COOH\rightleftharpoons C{H}_{3}CO{O}^{-}+H^{+}$

When $NaOH$ is added $H^{+}$ combines with $O{H}^{-}$ so concentration of $H^{+}$ decreases so equilibrium will shift towards right.

${CH}_{3}COOH+NaOH⟶{CH}_{3}COONa+H_{2}O$
Ionization of acetic acid will increase with the progress of its neutralization. This effect is called reverse ion effect.