Solve the Problem $\left[ \mathrm { H } ^ { + } \right]$

Multiple Choice

Solve the problem.
-The hydrogen ion concentration of a substance $\left[ \mathrm { H } ^ { + } \right]$ is about $5.2 \times 10 ^ { - 7 }$ moles per liter. Find the $\mathrm { pH }$ . Round to the nearest tenth. Use the formula $\mathrm { pH } = - \log \left[ \mathrm { H } ^ { + } \right]$ .

A) $- 7.7$
B) $6.3$
C) $6.6$
D) $7.7$