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C. Johannesson. A. Ionization of Water. Kw = [H3O ][OH-] = 1.0 ? 10-14. C. Johannesson. A. Ionization of Water. Find the hydroxide ion concentration of 3.0 ? 10-2 M HCl.. [H3O ][OH-] = 1.0 ? 10-14[3.0 ? 10-2][OH-] = 1.0 ? 10-14[OH-] = 3.3 ? 10-13 MAcidic or basic?. Acidic. C. Johannesson. pH = -log[H3O ].
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