SAMPLE PROBLEM 18.6
Find the Ka of a weak acid from the pH of its solution
Assumptions:
At a pH of 2.60, [H3O+]HPAc >> [H3O+]water
[PAc-]eq [H3O+]eq, and since HPAc is weak, [HPAc]eq [HPAc]initial = [HPAc]initial - [HPAc]dissociation
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