The molar conductivities at infinite dilution | vedclass

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(C) Key Idea: Kohlrausch law of independent migration of ions can be used to calculate $\Delta_m^o$ for weak electrolytes such as acetic acid.Given:$\

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$390.5 \ S \ cm^2 \ mol^{-1}$

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(C) Key Idea: Kohlrausch law of independent migration of ions can be used to calculate $\Delta_m^o$ for weak electrolytes such as acetic acid.Given:$\Delta_{m(NaAc)}^o = 91 \ S \ cm^2 \ mol^{-1}$$\Delta_{m(HCl)}^o = 425.9 \ S \ cm^2 \ mol^{-1}$$\Delta_{m(NaCl)}^o = 126.4 \ S \ cm^2 \ mol^{-1}$Using Kohlrausch law,the molar conductivity of acetic acid is calculated as:$\Delta_{m(CH_3COOH)}^o = \Delta_{m(CH_3COONa)}^o + \Delta_{m(HCl)}^o - \Delta_{m(NaCl)}^o$$= (91.0 + 425.9 - 126.4) \ S \ cm^2 \ mol^{-1}$$= 390.5 \ S \ cm^2 \ mol^{-1}$

The molar conductivities at infinite dilution for sodium acetate,$HCl$ and $NaCl$ are $91 \ S \ cm^2 \ mol^{-1}$,$425.9 \ S \ cm^2 \ mol^{-1}$ and $126.4 \ S \ cm^2 \ mol^{-1}$ respectively. The molar conductivity of acetic acid at infinite dilution is

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