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At 80 ^(@ ) C , pure distilled water ...

At ` 80 ^(@ ) C ,` pure distilled water has `[H_3O^(+) ]= 1 xx 10 ^(-6) " mol " L^(-1) ` The value of `K_w` at this temperature will be

A

` 1 xx 10^(-6)`

B

`1 xx 10^(-12)`

C

`1 xx 10^(-9)`

D

`1 xx 10^(-15)`

Text Solution

Verified by Experts

The correct Answer is:
B
`[H_(3)O^(+)]=1 xx 10^(-6)` mol `L^(-1)`
or `[H^(+)]=1 xx 10^(-6)` mol `L^(-1)`
As for distilled water `[H^(+)]=[OH^(-)]`
`[H^(+)]=[OH^(-)]= 1 xx 10(-6) ` mol `L^(-1)`
`K_(w)=[H^(=)][OH^(-)]`
`=10^(-12)mol^(2)L^(-2)`
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