What is the pH of a solution prepared by diluting 20.00 mL of 0.10 M HCl with enough water to produce a total volume of 100.00 mL?
A)1)00
B)1)70
C)2)00
D)3)40

Question

Quizplus · Accepted Answer

First, use the equation M1V1 = M2V2 to find the final concentration of HCl:

(0.10 M)(20.00 mL) = M2(100.00 mL)
M2 = 0.02 M

Then use the equation for pH of a strong acid:

pH = -log[H+]

Since HCl is a strong acid, [H+] = 0.02 M. Plug this into the equation above:

pH = -log(0.02) = 1.70

Therefore, the pH of the solution is 1.70, and the correct answer is (B).

What Is the PH of a Solution Prepared by Diluting