Tue July 03, 2012 By: Disha Zanwar

As the acid or base get diluted what happens to its pH value?

Expert Reply
Tue July 03, 2012
pH is defined as the -log of the concentration of hydrogen ions in a solution, or -log[H+]. As you add water to an acid, you are diluting it, thus lowering the concentration of H+. Putting a lower value in for [H+] in the equation -log[H+] will give you a great value than you originally had. This means the pH has increased, making the solution more basic.
Similarly for bases, the pH decreases if we dilute the solution.
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