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A certain buffer solution contains equal...

A certain buffer solution contains equal concentration of `X^(-)` and HX. `K_(b)`, for `X^(-)` is `10^(-10)`. Find the pH of buffer.

Text Solution

Verified by Experts

The correct Answer is:
4
` K_b =10 ^(-10 ) , Ka = 10 ^(-4) [X^(-) ]=[HX]`
` pH= P^(Ka) +log ""([X^(-)])/([HX]) =-log 10 ^(-4) =4`
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Knowledge Check

  • A basic buffer contains equal concentration of base and its salt . The dissociation of base is 10^(-6) . Then the pH of the buffer solution is

    A
    6
    B
    8
    C
    5
    D
    9

  • On diluting a buffer solution, its pH :

    A
    is increased
    B
    is decreased
    C
    remains constant
    D
    will change which be predicted unless dissociation of its weak acid (or base )is provided.

  • Which buffer solution has maximum pH?

    A
    mixture which is 0.1 M in `CH_3 COOH and 0.1 M is CH_3 COONa [pK_a (CH_3COOH )= 4.74`
    B
    mixture which is `0.2 M CH_3 COOH and 0.2 M is CH_3 COONa`
    C
    mixture which is `0.1 M ` in ` NH_4 Cl and 0.1 M `in `NH_4 OH [pK_a (NH_4^(+)) =9.26]`
    D
    all the solution have equal pH which is `4.74`

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    A buffer solution contains 0.2 mole of NH_4 OH and 0.2 mole of NH_4 Cl per litre. The PK_b of NH_4 OH is 4.75 The pH of the buffer will be

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