An aqueous solution with a pH of 10.60 is diluted from 1.0 L to 2.0 L.What is the pH of the diluted solution?
A) 5.30
B) 9.60
C) 10.30
D) 10.60
E) 10.90

Question

Quizplus · Accepted Answer

When a solution is diluted, the concentration of the solution decreases, but the pH remains constant.

pH = -log[H+]
10.60 = -log[H+]
[H+] = 2.511 x 10^-11 M

The new concentration of the solution after dilution is: 
2.511 x 10^-11 M / 2 = 1.256 x 10^-11 M

Therefore, the new pH of the diluted solution is:
pH = -log[H+]
pH = -log(1.256 x 10^-11)
pH = 10.30

Therefore, the answer is C.

An Aqueous Solution with a PH of 10