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

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 $\mathrm { pH } = 1.4$ .

A) $4.0 \times 10 ^ { - 2 }$
B) $2.5 \times 10 ^ { - 1 }$
C) $4.0 \times 10 ^ { - 1 }$
D) $2.5 \times 10 ^ { - 2 }$

Correct Answer:

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