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Kohlrausch Law

The molar con...

Question

The molar conductance of $N a C l, H C l$ and $C H_{3} C O O N a$ at infinite dilution are $126.45, 426.16$ and $91.0 S c m^{2} m o l^{- 1}$ respectively. The molar conductance of $C H_{3} C O O H$ at infinite dilution is.
Choose the right option for your answer.

A

540.48 S c m^{2} m o l^{- 1}

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B

201.28 S c m^{2} m o l^{- 1}

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C

390.71 S c m^{2} m o l^{- 1}

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D

698.28 S c m^{2} m o l^{- 1}

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Solution

The correct option is C $390.71 S c m^{2} m o l^{- 1}$
According to Kohlrausch law of independent
migration of ions.
$Λ_{m}^{0} (C H_{3} C O O H)$
$= Λ_{m}^{0} (C H_{3} C O O N a) + Λ_{m}^{0} (H C l) - Λ_{m}^{0} (N a C l)$
$= 91.0 S c m^{2} m o l^{- 1} + 426.16 S c m^{2} m o l^{- 1} - 126.45 S c m^{2} m o l^{- 1}$
$= 390.71 S c m^{2} m o l^{- 1}$

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