Question

Question #17d18

Answer 1

`1.2 xx 10^-10M`

Explanation:

We're trying to find the `[H_3O^+]` of a solution with a given `pOH`.

We know that `pH` and the `pOH` must add up to `14.00`:

`pH + pOH = 14.00`

and the relationship between `pH` and the `[H_3O^+]` is

`[H_3O^+] = 10^(-pH)`

Thus,

`pH = 14.00 - 4.07 = 9.93`

`[H_3O^+] = 10^(-9.93) = color(red)(1.2 xx 10^-10 M`