Understanding the Relationship
* pH and pOH: pH and pOH are related to the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.
* The Equation: pH + pOH = 14
* Inverse Relationship: As pH increases, pOH decreases, and vice versa.
Calculations
1. Find pOH:
* pOH = 14 - pH = 14 - 9 = 5
2. Calculate [OH-] from pOH:
* [OH-] = 10^(-pOH) = 10^(-5) = 1 x 10^-5 M
Therefore, a solution with a pH of 9 has a hydroxide ion concentration of 1 x 10^-5 M.
