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State Ostwald's dilution law....

State Ostwald's dilution law.

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When dilution increases, the degree of dissociation of weak electrolyte also increases. The mathematical form is
`alpha=sqrt((K_(a))/(C ))`
where `.alpha.` is the degree of dissociation, `K_(a)` is the dissociation constant of the acid and `.C.` is its concentration.
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Knowledge Check

  • Which one of the following formula represents Ostwald's dilution law for a binary whose degree of dissociation is alpha and concentration C.

    A
    `K=((1-alpha)C)/(alpha)`
    B
    `K=(alpha^2 C)/( 1-a)`
    C
    `K=((1-a)C)/(alpha^2)`
    D
    `K=(alpha^2 C)/((1-alpha)C)`

  • Assertion : Ostwald's dilution law is K_a=(alpha^2 C)/(1-alpha) Reason : Ostwald's dilution law is applicable only to strong electrolyte.

    A
    (A) and ( R) are true and ( R) is the correct explanation of (A)
    B
    Both (A) and ( R) are true but ( R) does not explain (A)
    C
    (A ) is true but (R ) is false
    D
    Both (A) and ( R) are false

  • Ostwald's dilution law is applicable in the case of the solution of

    A
    `CH_3 COOH`
    B
    `Na CI`
    C
    `NaOH`
    D
    `H_2SO_4`

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    Derive an expression for Ostwaid's dilution law.

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