1.

An aqueous solution contains 0.10 M H_(2)S and 0.20 M HCl. If the equilibrium constants for the formation of HS^(–) from H_(2)S is 1.0xx10^(–7) and that of S^(2-) from HS^(–) ions is 1.2xx10^(–13) then the concentration of S^(2-) ions in aqueous solution is

Answer»

`3xx10^(-20)`
`6XX10^(-21)`
`5xx10^(-19)`
`5xx10^(-8)`

Solution :`{:(HCL to, H^(+),+, CI^(-)),(,(0.2+x+y),,0.2):}`
`{:(H_(2)ShArrH^(+),+, HS^(-):Ka_(1)=10^(-7)),(0.1-x(0.2+x+y),,(x-y)),(HS^(-)hArrH^(+),+,S^(2-):K_(a_(2))=1.2xx10^(-13)):}`


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