the H+ and the OH- has the following relationship as
follows
[H+] [OH-] = Kw
here Kw = water ionization constant = 1.0 * 10 -14
[H+] = 2.3 * 10-5 M
[H+] [OH-] = 1.0 * 10 -14
[OH-] = 1.0 * 10 -14 / [H+]
[OH-] = 1.0 * 10 -14 / 2.3 * 10-5
[OH-] = 4.34782*10-10
answer => [OH-] = 4.35*10-10 M
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