What is the pH of a solution with an H+ ion concentration of 1 x 10^-2 M?

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Multiple Choice

What is the pH of a solution with an H+ ion concentration of 1 x 10^-2 M?

Explanation:
pH is the negative base-10 logarithm of the hydrogen ion concentration. For [H+] = 1 × 10^-2 M, pH = -log10(1 × 10^-2) = 2. This shows why the solution is acidic (pH below 7). The scale is logarithmic, so a tenfold change in [H+] changes the pH by 1 unit. In this case, 0.01 M hydrogen ions correspond to a pH of 2. For reference, pH 12 or 13 would require [H+] of 1 × 10^-12 or 1 × 10^-13 M, and pH 1 would require [H+] of 0.1 M.

pH is the negative base-10 logarithm of the hydrogen ion concentration. For [H+] = 1 × 10^-2 M, pH = -log10(1 × 10^-2) = 2. This shows why the solution is acidic (pH below 7). The scale is logarithmic, so a tenfold change in [H+] changes the pH by 1 unit. In this case, 0.01 M hydrogen ions correspond to a pH of 2. For reference, pH 12 or 13 would require [H+] of 1 × 10^-12 or 1 × 10^-13 M, and pH 1 would require [H+] of 0.1 M.

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