A student dissolved a certain amount of a weak acid (HA) in some water. She then titrated this solution against NaOH of some unknown concentration. When she had added 5mL of NaOH the pH of the solution was found to be 5. It took a total of 20mL of NaOH to completely neutralize the acid solution she had prepared. What is the acid dissociation constant (\(K_a\)) of the weak acid, HA?
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