1.

At 25^(@)C, the dissociation constant of a base BOH is 1.0xx10^(-12). The concentration of hydroxyl ions in 0.01 M aqueous solution of base would be :

Answer»

`1.0xx10^(-5) MOL L^(-1)`
`1.0xx10^(-6)mol L^(-1)`
`2.0xx10^(-6)mol L^(-1)`
`1.0xx10^(-7)mol L^(-1)`

Solution :`K_(b)=1.0xx10^(-12)`
`[BOH]=0.01 M`
`{:(,BOH,hArr,B^(+),+,OH^(-)),("Initial",1,,0,,0),("conc.",,,,,),("At equal.",(1-X),,CX,,Cx):}`
`K_(b)=((Cx)xx(Cx))/(C(1-x))=(Cx^(2))/(1-x)=1.0xx10^(-12)`
or `(0.01x^(2))/(1)=1.0xx10^(-12)(1-x ~~ 1)`
`x = 1.0xx10^(-7)mol L^(-1)`


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