What is the PoH of a solution with OH 9.010-7?

To find the pH from the hydroxide ion concentration (OH⁻), you can use the formula pOH = -log[OH⁻]. Given that [OH⁻] = 9.0 × 10⁻⁷ M, the pOH is approximately 6.05. Since pH + pOH = 14, the pH can be calculated as pH = 14 - pOH, which results in a pH of approximately 7.95.