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What can be the maximum possible molarit...

What can be the maximum possible molarity of `Co^(2+)` ions in 0.1 M HC1 saturated with `H_(2)S (K_(a) = 4 xx 10^(-21))`? Given that `K_(sp)` for CoS is `2 xx 10^(-21)` and concentration of saturated `H_(2)S = 0.1 M`

Text Solution

Verified by Experts

The correct Answer is:
0.05
`K_(a)(H_(2)S) = 4 xx 10^(-21)`
`=([H^(+)]^(2)[S^(2-)])/([H_(2)S]) =(0.1^(2) xx [S^(2-)])/(0.1)`
`rArr [S^(2-)] = 4 xx 10^(-20)` M
`[Co^(2+)] xx 4 xx 10^(-20) rArr [Co^(2+)] = 0.05` M
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