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Standard IX

Physics

Thermal Expansion

Which one of ...

Question

Which one of the following formulae represents Ostwald's dlution law for a binary electrolyte whose degree of dissociation is ' $α$ ' and concentration $C$ ?

K = \frac{(1 - α) C}{α}

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K = \frac{α^{2} C}{(1 - α)}

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K = \frac{(1 - α) C}{α^{2}}

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K = \frac{α^{2}}{(1 - α) C}

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Solution

The correct option is B $K = \frac{α^{2} C}{(1 - α)}$
$A B ⇌ A^{+} + B^{-}$
$C$ $0$ $0$
$C (1 - α)$ $C α$ $C α$
$K_{a} = \frac{[A^{+}] [B^{-}]}{[A B]}$
$K_{a} = \frac{C α \times C α}{C (1 - α)} = C \frac{α^{2}}{1 - α}$

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Which one of the following formulae represents Ostwald's dlution law for a binary electrolyte whose degree of dissociation is 'α' and concentration C?

The correct option is B K=α2C(1−α)AB⇌A++B− C 0 0C(1−α) Cα CαKa=[A+][B−][AB]Ka=Cα×CαC(1−α)=Cα21−α

Which one of the following formulae represents Ostwald's dlution law for a binary electrolyte whose degree of dissociation is ' $α$ ' and concentration $C$ ?

The correct option is B $K = \frac{α^{2} C}{(1 - α)}$
$A B ⇌ A^{+} + B^{-}$
$C$ $0$ $0$
$C (1 - α)$ $C α$ $C α$
$K_{a} = \frac{[A^{+}] [B^{-}]}{[A B]}$
$K_{a} = \frac{C α \times C α}{C (1 - α)} = C \frac{α^{2}}{1 - α}$