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-log(1.2 X 10^-5 M H(+)) = 4.9 pH H(+)
solution with [OH-] = 2.5 x 10-9 , A solution with [H+] = 1.2 x 10-4, A solution with pH = 4.5
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h = -5 -7 * -5 = 35 A negative times a negative equals a positive.