Biochemistry at The Biology Project

Acids & Bases Problem Set

Question 5. More pH Calculations

What is the pH of a 10 - 10 M solution of HCl?

The correct answer is: 7
Although -log [10 - 10] = 10, common sense dictates that a very small amount of acid does not make a solution basic. Rather, such a small concentration of H + ions (10 - 10 M) is far below the H + concentration for water (10 - 7 M), thus the pH remains at 7.

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