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The logarithm of a product of two numbers is the sum of the logarithms of the two multiplied numbers separately. The logarithm of 2 (to the justified number of significant digits) is 0.30, and the logarithm of 10-6 is -6. The sum is therefore -5.3, and the pH, defined as the negative of the logarithm, is 5.3.

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14y ago

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