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Q.

The molar conductances of sodium acetate, hydrochloric acid and sodium chloride are 91.0, 425.9 and 126.4 S cm² mol^-1 respectively at 25°C at infinite dilution. What is the molar conductance of acetic acid at infinite dilution ?

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a

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

b

$43.5 S {cm}^{2} {mol}^{- 1}$

c

$643.3 S {cm}^{2} {mol}^{- 1}$

d

$461.3 S {cm}^{2} {mol}^{- 1}$

answer is A.

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Detailed Solution

$λ_{{CH}_{3} COOH}^{0} = λ_{{CH}_{3} {COO}^{-}}^{0} + λ_{{Na}^{+}}^{0} + λ_{H^{+}}^{0} + λ_{{Cl}^{-}}^{0} - λ_{{Na}^{+}}^{0} - λ_{{Cl}^{-}}^{0}$

$λ_{{CH}_{3} COOH}^{0} = 91 + 425.9 - 126.4 = 390.5$

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The molar conductances of sodium acetate, hydrochloric acid and sodium chloride are 91.0, 425.9 and 126.4 S cm2 mol-1 respectively at 25°C at infinite dilution. What is the molar conductance of acetic acid at infinite dilution ?