November 29, 2015

Homework Help: Chemistry

Posted by Patrick on Thursday, March 10, 2011 at 8:18am.

A student titrates 0.025 M KOH into 50.00 ml of a solution of unknown weak acid HA. Equivalence point is reached when 30.00 ml of the KOH has been added. After 15.00ml of the KOH has been added the pH of the mixture is 3.92.

A. What is the concentration of HA ?

B. What is Ka for HA ?

C. What is the pH of the HA before any KOH is added?

D. What is the pH at equivalence point?

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