Question

What is the pH of a solution that has an `OH^-` concentration of `1*10^-9` `M`?

Answer 1

`pH=5`

Explanation:

`pH+pOH=14`

`[HO^-]` `=` `1xx10^-9`, and `pOH=-log_10[HO^-]` `=` `-(-9)=9`

And thus `pH=5`