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A 20.0 mL sample of a weak acid, HX is titrated to the endpoint and requires...

A 20.0 mL sample of a weak acid, HX is titrated to the endpoint and requires 50.0mL of .050M KOH After the addition of the first 30.0 mL of KOH the pH of the solution is 5.00 M What is the Ka for this weak acid, HX

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