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Q. The correct order of equivalent conductances at infinite dilution in water at room temperature for $H^+, K^+, CH_3COO^-$ and $HO^-$ ions is

WBJEEWBJEE 2013Electrochemistry

Solution:

Equivalent conductance $\left( \Lambda _{e q}\right)$ is defined as the conducting power of all the ions produced by one gram equivalent of an electrolyte in a given solution.ln case of weak electrolytes (as $CH _{3} COOH _{1} NH _{4} OH , AgCl$ etc.), ionisation is very
small compared to strong electrolytes (as $KCl$, $NaOH$ etc.), hence $\Lambda_{\text {eq }}$ of weak electrolyte is low. Moreover, ionisation of $H ^{+}$is maximum among given ions. Thus, correct of order of $\Lambda _{\text {eq }}$ is
$ H ^{+}> OH ^{-}> K ^{+}> CH _{3} COO ^{-} $