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What will be the degree of dissociation ...

What will be the degree of dissociation of 0.005M `NH_(4)OH`solution. If `pK_(b)` for `NH_(4)OH` is 4.7

A

`2%`

B

`0.03%`

C

`1.4%`

D

`6. 32%`

Text Solution

Verified by Experts

The correct Answer is:
D
`pK_(b)=4.2`
`K_(b)=10^(-5)xx10^(0.3)`
`K_(b)=2xx10^(-5)=Calpha^(2)`
`2xx10^(-5)=5xx10^(-3) a^(2)`
`alpha^(2)=(2xx10^(-5))/(5xx10^(-3))=0.4xx10^(-2)`
`alpha^(2)=6.32xx10^(-2)xx100=6.32%`
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Knowledge Check

  • In which of the following dissociation of NH_(4)OH will be minimum

    A
    NaOH
    B
    `H_(2)O`
    C
    `NH_(4)Cl`
    D
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  • 0.05 M ammonium hydroxide solution is dissolved in 0.001 M ammonium chloride solution. What will be the OH^(-) ion concentration of this solution ? (K_(b) (NH_(4) OH) = 1.8 xx 10^(-5)

    A
    `3.0 xx 10^(-3)`
    B
    `9.0 xx 10^(-4)`
    C
    `9.0 xx 10^(-3)`
    D
    `3.0 xx 10^(-4)`

  • The pH of a buffer solution of 0.1 M NH_(4)OH [ pK_(a)=4.0] and 0.1 M NH_(4)Cl is

    A
    1
    B
    4
    C
    10
    D
    13

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