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 the $\mathrm { pH }$ if $\left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right] = 1.0 \times 10 ^ { - 5 }$.
A) $- 9$
B) $- 5$
C) 5
D) 9

Question

Quizplus · Accepted Answer

The pH is calculated using the formula $\mathrm { pH } = - \log \left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right]$. Substituting $\left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right] = 1.0 \times 10 ^ { - 5 }$ into the formula gives $\mathrm { pH } = - \log (1.0 \times 10 ^ { - 5 }) = 5$.

Round Your Answer to the Nearest Tenth, When Appropriate pH=−log⁡[H3O+]\mathrm { pH } = - \log \left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right]pH=−log[H3​O+]

Round Your Answer to the Nearest Tenth, When Appropriate $\mathrm { pH } = - \log \left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right]$