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Which change would decrease the pH of a base in a solution at equilibrium?(1 point)

Responses

increasing the initial concentration of solute
increasing the initial concentration of solute

decreasing the concentration of OH– ions
decreasing the concentration of OH – ions

increasing the strength of the base
increasing the strength of the base

decreasing the amount of water added to the solute
decreasing the amount of water added to the solute

1 answer

To decrease the pH of a base in a solution at equilibrium, the most relevant action would be:

Decreasing the concentration of OH– ions.

This is because pH is a measure of the hydrogen ion concentration in a solution, and since pH and pOH are related (pH + pOH = 14), decreasing the concentration of hydroxide ions (OH–) will increase the hydrogen ion concentration (H+), thereby decreasing the pH.

The other options either do not impact the pH directly or would tend to increase the pH in the case of increasing the strength of the base or solute concentration.