The change that would decrease the pH of a base in a solution at equilibrium is : ( C ) Decreasing the concentration of OH⁻ ions
A base in a solution provides ( OH⁻ ions ) while an acids produces H⁺ ions. therefore an acidic solution ( solution with a lower pH level ) has more H⁺ ions and a decrease in OH⁻ will lead to a corresponding increase in H⁺ ions. so when the concentration of OH⁻ ions is reduced the pH of the base in the solution will be reduced
Hence we can conclude that in order to decrease the pH of a base in a solution at equilibrium decreasing the concentration of OH⁻ ions will help decrease the pH level of the base .
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Explanation:
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