The chemical acidity of a solution is measured in units of pH: $\mathrm { pH } = - \log \left[ \mathrm { H } ^ { + } \right]$ , where $\left[ \mathrm { H } ^ { + } \right]$ is the hydrogen ion concentration in the solution.What is $\left[ \mathrm { H } ^ { + } \right]$ if the $\mathrm { pH } = 6.8$ ?
A) $1.58 \times 10 ^ { - 7 }$
B) $6.31 \times 10 ^ { - 7 }$
C) $6.31 \times 10 ^ { - 6 }$
D) $1.58 \times 10 ^ { - 6 }$
E)6.800

Question

Quizplus · Accepted Answer

The hydrogen ion concentration $\left[ \mathrm { H } ^ { + } \right]$ can be found by rearranging the pH equation: $\left[ \mathrm { H } ^ { + } \right] = 10^{-\mathrm{pH}}$. Substituting $\mathrm{pH} = 6.8$ gives $\left[ \mathrm { H } ^ { + } \right] = 10^{-6.8} = 1.58 \times 10^{-7}$.

The Chemical Acidity of a Solution Is Measured in Units pH=−log⁡[H+]\mathrm { pH } = - \log \left[ \mathrm { H } ^ { + } \right]pH=−log[H+]

The Chemical Acidity of a Solution Is Measured in Units $\mathrm { pH } = - \log \left[ \mathrm { H } ^ { + } \right]$