<span>About the conservation of energy. Suppose you are in a vacuum and you bunch a basketball. You will notice that no matter how much you will leave the ball bunching the ball will never stop. That happens because the ball develops both potential and kinetic energy, the sum of those two give us the mechanical energy which remains constant. We have to suppose that friction is zero otherwise you have to count for thermal loses. </span>I hope that this is the answer that you were looking for and it has helped you.
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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