1.

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

Answer»


Solution :`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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