Step 1 - The definition of pH
The pH of a solution is defined as:
[tex]pH=-log[H^+\rbrack[/tex]Therefore, if we know its H+ concentration, we can calculate its pH.
Step 2 - Calculating the pH
[tex]\begin{gathered} [H^+\rbrack=10^{-12}mol/L \\ \\ pH=-log10^{-12} \\ \\ pH=-(-12)\times log10=12 \end{gathered}[/tex]Answer: the pH of this solution is 12.
