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Which pH change represents a hundredfold increase in the concentration of H3O+?
(1) pH 5 to pH 7 (3) pH 3 to pH 1(2) pH 13 to pH 14 (4) pH 4 to pH 3
The answer is (3) pH 3 to pH 1. The pH is related to the concentration of H3O+ with the relationship: pH = -lg c(H+). So when concentration of H3O+ increase, the pH will decrease. And decrease 2 when when increase hundredfold. Because 100=10^2.
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