Answer:
[tex]pH=10.5[/tex]
Explanation:
Hello,
In this case, since we define the pH as:
[tex]pH=-log([H^+])[/tex]
We can directly compute it by using the given concentration of H⁺:
[tex]pH=-log(3.5x10^{-11})\\\\pH=10.5[/tex]
For which we conclude it is a basic solution as the pH is greater than 7.
Best regards.