The pH of a solution of a strong acid is 5.0.

Question:
The pH of a solution of a strong acid is 5.0. What will be the pH of the solution obtained after diluting the given solution 100 times?

Solution:

As we dilute the solution, the concentration of the solution will reduce by how much times we are diluting it.

When diluted 100 times [h+] = 10-5/100 = 10-7mol/L

And, pH Value will be = pH = -log [H+]

=-log [10-7] = 7

Hence the pH after diluting solution a hundred times will be 7.