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An aqueous solution contains 0.10 M H2S ...

An aqueous solution contains` 0.10` M H2S and `0.20 `M HCl. If the equilibrium constants for the formation of `HS^(-)` from`H_(2)S" is " 1.0 xx 10^(-7) " and that of " S^(2-) " from " 4S^(-) " ions is " 1.2 xx 10^(-13) `, then find the concentration of `S^(-2)` ions in aqueous solution

Text Solution

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`underset((0.1 - x))(H_(2)S(aq.)) hArr underset((2x + 0.29))(2H^(+) )+ underset(x)(S^(2-) )`
`K_(a) = K_(a_(1)) xx K_(a_(2)) = 1.2 xx 10^(-20) `
`1.2 xx 10^(-20) = ((0.2)^(2-) [S^(2-)])/(0.1) , [S^(2-)] = 3 xx 10^(-20) `
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