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Equivalent, Molar Conductivity and Cell Constant

The ionic con...

Question

The ionic conductivity of $B a^{2 +}$ and $C l^{-}$ at infinite dilution are $127$ and $76 {ohm}^{- 1} c m^{2} m o l^{- 1}$ respectively .The equivalent conductivity of $B a C l_{2}$ at infinity dilution $({in ohm}^{- 1} c m^{2} e q^{- 1}$ ) would be :

A

279

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B

203

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C

139.5

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D

101.5

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Solution

The correct option is C $139.5$
Correct option :B

The equivalent weight of $B a C l_{2} = \frac{molecular weight}{2}$

Equivalent conductivity of $(B a C l_{2}), Λ_{m}^{\infty} = \frac{1}{2} λ_{m}^{\infty} (B a^{2 +}) + λ_{m}^{\infty} (C l^{-})$
$= 63.5 + 76 = 139.5 {ohm}^{- 1} c m^{2} e q^{- 1}$

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