Solve the Problem $\mathrm{pH}=-\log \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]$ , as Needed $\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]$ If The

Multiple Choice

Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula $\mathrm{pH}=-\log \left[\mathrm{H}_{3} \mathrm{O}^{+}\right]$ , as needed.
-Find $\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]$ if the $\mathrm{pH}=12$ .

A) $1.0 \times 1012$
B) $2.0 \times 1012$
C) $3.0 \times 10^{-12}$
D) $1.0 \times 10-12$