H}_{3}}COOH)=\,\,\] \[{{\wedge }^{o}}(C{{H}_{3}}COONa)\]\[+{{\wedge }^{o}}(HCl)-\,\,{{\wedge }^{o}}(NaCl)\] \[=91+426.16-126.45=390.71\,\,OH{{m}^{-1}}c{{m}^{2}}mo{{l}^{-1}}\].