If an acid has a pH of 2, what is its [H^ + ] ?

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The concepts of pH and acid strength are only loosely related to each other. You can get to a pH of 2 with either a fairly concentrated solution of a weak acid or a very dilute solution of a strong acid.

0.01 M strong acid (HCl, HNO 3 , HClO 4 , etc.) has a pH of 2.0

HNO 2 , nitrous acid, a fairly strongish weak acid, has a pKa of 3.39 (Ka = 4 x 10 −4 ). A 1 M solution of nitrous acid will have a pH of 1.7.

So you see, just knowing the pH (unless it’s significantly less than 1) doesn’t tell you whether the acid is strong or weak.

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