Chemistry - Electrochemistry Question with Solution | TestHub

According to Kohlrausch's law of independent migration of ions:

${\Lambda }_m^{\circ }({\text{CH}}_3\text{COOH})={\Lambda }_m^{\circ }({\text{CH}}_3\text{COONa})+{\Lambda }_m^{\circ }(\text{HCl})-{\Lambda }_m^{\circ }(\text{NaCl})$

Substituting the given values:

${\Lambda }_m^{\circ }({\text{CH}}_3\text{COOH})=91.0+426.16-126.45$

${\Lambda }_m^{\circ }({\text{CH}}_3\text{COOH})=517.16-126.45=390.71{\text{ S cm}}^2{\text{ mol}}^{-1}$

Answer: 390.71 S ${\text{cm}}^2{\text{mol}}^{-1}$