To determine the pOH of a solution with a hydroxide ion concentration [tex]\(\left[ OH^- \right]= 1.4 \times 10^{-13}\)[/tex] M, we follow these steps:
1. Understanding the Relationship: The pOH is calculated from the concentration of hydroxide ions using the formula:
[tex]\[
\text{pOH} = -\log \left[ OH^- \right]
\][/tex]
2. Substitute the Given Value: Substitute the given hydroxide ion concentration into the formula:
[tex]\[
\text{pOH} = -\log \left( 1.4 \times 10^{-13} \right)
\][/tex]
3. Calculate the Logarithm: To find the pOH, calculate the logarithm (base 10) of the hydroxide concentration. The logarithmic calculation yields a pOH value.
4. Result and Options Comparison: After computation, the resulting pOH value is approximately 12.85.
Therefore, the pOH of the solution is:
A. 12.85
