show increase or decrease of PH with the change in concentration of H+ and OH- ions

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Solution

When the concentration of H⁺ ions increases or concentration of OH^- ions decreases, acidity increases and the value of pH will decrease.
Similarly, when the concentration of H⁺ions decreases or the concentration of OH^-ions increases, basicity increases and hence the value of pH will increase.
When, concentration of H⁺ions is equal to that of OH^- ions, the solution is neutral which has a pH value of 7.

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