1.

At `90^(@)C` , pure water has `[H_(3)O^(+)]` as `10^(-6)` mol `L^(-1)`. What is the value of `K_(w)` at `90^(@)C` ?A. `10^(-6)`B. `10^(-12)`C. `10^(-14)`D. `10^(-8)`

Answer» Correct Answer - B
`[H_(3)O^(o+)] = 10^(-6) = [overset(Theta)OH]`
Because in pure water, `[H_(3)O^(o+)] = [overset(Theta)OH]`
`K_(w) = [H_(3)O^(o+)] = [overset(Theta)OH]`
`= 10^(-6) xx 10^(-6)`
`= 10^(-12)`


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