Question

Hydrogen ion concentration of an aqueous solution is `1 xx 10^(-8) M`. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of mol `dm^(-3)` is
A. `1 xx 10^(-8)`
B. `1 xx 10^(-6)`
C. `2 xx 10^(-10)`
D. `0.5 xx 10^(-10)`

Answer 1

Correct Answer - D
`[OH^(-)]` of aqueous solution `=(1xx10^(-14))/(1 xx 10^(-4))`
`=1 xx 10^(-10)M`
When the solution is diluted by adding equal volume of water, then concentration of the `OH^(-)` ions is halved.
`i.e., (1)/(2) xx 1xx 10^(-10) =0.5 xx 10^(-10) M`