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Standard XII

Chemistry

Ionic Conductance

The molar con...

Question

The molar conductivities $\land {^{0}}_{N a O A c}$ and $\land {^{0}}_{H C l}$ at infinite dilution in water at $25^{0}$ C are $91.0$ and $426.2 S c m^{2}$ /mol respectively.
To calculate $\land {^{0}}_{H O A c}$ , the additional value required is :

\land {^{0}}_{H_{2} O}

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\land {^{0}}_{K C l}

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\land {^{0}}_{N a O H}

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\land {^{0}}_{N a C l}

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Solution

The correct option is D $\land {^{0}}_{N a C l}$
According to kohlrausch law of independent migration of ions, the molar conductivity of an electrolyte at infinite dilution is equal to the sum of the contributions of the molar conductivites of its ions.

Hence,
$Λ_{H O A c}^{\infty} = Λ_{H +}^{\infty} + Λ_{A c O -}^{\infty} = Λ_{N a O A c}^{\infty} + Λ_{H C l}^{\infty} - Λ_{N a C l}^{\infty}$
Hence the additional value required is $Λ_{N a C l} .$

Option D is correct.

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Similar questions

The molar conductivities of $\land_{N a O A C}^{0}$ and $\land_{H C l}^{0}$ at infinite dilution in water at $25^{0} C$ and 91.0 and $426.2 S c m^{2} / m o l$ respectively. To calculate $\land_{H O A c}^{0}$ , the additional value required is:

Q. The molar conductivities of

N a O A c

and

H C l

at infinite dilution in water at

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are

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Q. The molar conductivities of

\land_{N a O A c}^{\circ}

and

\land_{H C l}^{\circ}

at infinite dilution in water at

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are

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

respectively. To calculate,

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Q. The molar conductance of sodium acetate

(C H_{3} C O O N a)

, hydrochloric acid

(H C l)

and sodium chloride

(N a C l)

at infinite dilution are

91.0 \times 10^{- 4}, 426.16 \times 10^{- 4} and 126.45 \times 10^{- 4} S m^{2} m o l^{- 1}

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at infinite dilution are

126.45, 426.16

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Choose the right option for your answer.

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The molar conductivities ∧0NaOAc and ∧0HCl at infinite dilution in water at 250C are 91.0 and 426.2Scm2 /mol respectively. To calculate ∧0HOAc, the additional value required is :

The molar conductivities $\land {^{0}}_{N a O A c}$ and $\land {^{0}}_{H C l}$ at infinite dilution in water at $25^{0}$ C are $91.0$ and $426.2 S c m^{2}$ /mol respectively.
To calculate $\land {^{0}}_{H O A c}$ , the additional value required is :