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3: The negative of the logarithm (base 10) of the concentration. The logarithm of 1 is 0 and the logarithm of 10-3 is -3; the logarithm of their product is the sum of their individual logarithms, -3 in this instance, and the negative of -3 is +3.

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Q: What is the pH of an aqueous solution with a H plus concentration of 1 X 10-3 M?
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