Answer:
[tex] \huge 9[/tex]
Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ { H_3O}^{+}][/tex]
From the question we have
[tex]pH = - log(1 \times {10}^{ - 9} ) [/tex]
We have the final answer as
9
Hope this helps you
