The change that would decrease the pH of a base in a solution at equilibrium would be decreasing the concentration of OH– ions.
The pH of a solution refers to the negative logarithm of hydrogen ion concentration of the solution.
The higher the concentration of hydrogen ions, the lower the pH of the solution.
Usually, a base has a high pH. The more concentrated a base is, the higher the pH of the solution.
To decrease the pH of a base in solution, the concentration of hydrogen ions must far exceed the concentration of hydroxide ions and that can only be achieved by decreasing the concentration of OH– ions.
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