SAMPLE PROBLEM 18.6
(continued)
concentration (M)
HPAc(aq) + H2O(l) H3O+(aq) + PAc-(aq)
[H3O+] = 10-pH = 2.5 x 10-3 M, which is >> 10-7 ([H3O+] from water)
x 2.5 x 10-3 M [H3O+] [PAc-]
[HPAc]eq = 0.12 - x 0.12 M
Ka =
= 5.2 x 10-5
Testing the assumptions:
= 4 x 10-3 %
= 2.1 %
(the 5% rule is not violated in either case)
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