Final answer:
The higher the pH, the lower the OH⁻ concentration. pH is a measure of the acidity or basicity of a solution. As the pH increases, the concentration of hydronium ions (H₃O⁺) decreases, which means that the concentration of hydroxide ions (OH⁻) also decreases.
Step-by-step explanation:
The higher the pH, the lower the OH⁻ concentration. pH is a measure of the acidity or basicity of a solution. A pH value below 7 indicates an acidic solution, while a pH value above 7 indicates a basic solution. As the pH increases, the concentration of hydronium ions (H₃O⁺) decreases, which means that the concentration of hydroxide ions (OH⁻) also decreases. Therefore, the higher the pH, the lower the OH⁻ concentration.