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The number of S^(2-) ions present in 1 L...

The number of `S^(2-)` ions present in `1 L` of `0.1 (M) H_(2)S` solution having `[H^(+)]=0.1 (M)` is
( Given `H_(2)ShArr2H^(+)+S^(2-) K_(a)=1.1xx10^(-21)`)

A

`6.625xx10^(3)`

B

`6.625xx10^(4)`

C

`6.625xx10^(5)`

D

`6.625xx10^(6)`

Text Solution

Verified by Experts

The correct Answer is:
A
`H_(2)S underset(larr)(rarr) 2H^(+)+S^(2-)`
`K_(a)=1.1xx10^(-21)=([H^(+)]^(2)[S^(2-)])/([H_(2)S])=(10^(-2)xx[S^(2-)])/(0.1)`
or `[S^(2-)]=1.1xx10^(-20)(m)`
` :. ` no. of `S^(2-) ions =1.1xx10^(-20)xx6.0^(23)xx10^(23)`
`=1.1xx6.023xx10^(3)=6.625xx10^(3)`
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