Chemistry

Problem

Calculate the dissociation constant of

NH_4OH

25^\circ C

, if

\Delta H^\circ

and

\Delta S^\circ

for the given changes are as follows : -

NH_3 + H^+ \rightleftharpoons NH_4^+; \quad \Delta H^\circ = -52.2 \text{ kJ mol}^{-1}

H_2O \rightleftharpoons H^+ + OH^-; \quad \Delta H^\circ = 56.6 \text{ kJ mol}^{-1}

NH_4OH \rightleftharpoons NH_4^+ + OH^-; \quad \Delta S^\circ = -76.53 \text{ JK}^{-1} \text{ mol}^{-1}