1.

At 25^(@)C, the dissociation constant of a base BOH is 1.0 xx 10^(-12). The concentration of Hydroxyl ion in 0.01 M aqueous solution of the base would be

Answer»

`2.0 xx 10^(-6) mol L^(-1)`
`1.0 xx 10^(-5) mol L^(-1)`
`1.0 xx 10^(-6) mol L^(-1)`
`1.0 xx 10^(-7) mol L^(-1)`

SOLUTION :`{:(,BOH,HARR,B^(+),+,OH^(-)),("Initial",C,,0,,0),("At eq.",C- C alpha,,C alpha,,C alpha):}`
`K_(b) = (C^(2)alpha^(2))/(C(1-alpha)) = Calpha^(2)` assuming `alpha lt lt 1, 1 - alpha ~= 1`
`10^(-12) = 10^(-2) xx alpha^(2) , alpha^(2) = 10^(-10) , alpha = 10^(-5)`
`[OH^(-)] = C alpha = .01 xx 10^(-5) = 10^(-7)`.


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