SAMPLE PROBLEM 18.9
(continued)
x = 3.0 x 10-2 M = [OH-]
Check assumption:
[3.0 x 10-2 M / 1.5 M] x 100 = 2% (error is < 5%; thus, assumption is justified)
[H3O+] = Kw/[OH-] = 1.0 x 10-14/3.0 x 10-2 = 3.3 x 10-13 M
pH = -log (3.3 x 10-13) = 12.48
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