What is the pH of a solution that has a H^+ concentration equal to 1.7 x 10^-5 M?

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The definition of pH is this:

pH = -log [H^+]

pH = -log 1.7 x 10^-5

pH = 4.77

Please be aware that the answer has two sig figs. The 4 (which is not significant) encodes the decimal places in the answer.

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