HA (a q) ⇌ H^+(a q)+ A^-(a q) The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20 °C. The dissociation…

$$\mathrm{HA}(a q) \rightleftharpoons \mathrm{H}^{+}(a q)+\mathrm{A}^{-}(a q) $$ The freezing point depression of a $\displaystyle 0.1$ m aqueous solution of a monobasic weak acid HA is $\displaystyle 0.20$ °C. The dissociation constant for the acid is Given : $\displaystyle \mathrm{K}_{\mathrm{f}}\left(\mathrm{H}_2 \mathrm{O}\right)=1.8 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, molality $\displaystyle \equiv$ molarity