1.
Equivalent conductance of 0.1M0.1\,\text{M} HA (weak acid) solution is 10S cm2equivalent110\,\text{S cm}^2\,\text{equivalent}^{-1} and that at infinite dilution is 200S cm2equivalent1200\,\text{S cm}^2\,\text{equivalent}^{-1}. Hence pH of HA solution is