(Solved) Chemistry Lab Final...Acid/Base pKa Calculation....Please Help!?

My chemistry lab final is asking us to calculate the molecular mass as well as the pKa values of an unknown monoprotic acid. We ran a total of 4 titration trials which allowed us to complete the following calculations: Mass of Sample, Initial and Final Burette Reading, Net mL Titrated, Moles of Titrant Used, Mean molar mass, Standard Deviation, %RSD, and a 95% Confidence Interval. I still have to calculate the pKa value of the acid as well as find the molecular mass. I am completely stuck on how to do this, since i don't have any pH readings. However, i believe it is possible to solve for pKa. Is this possible? Please help!
Thanks Caroline for helping with the pKa calculation. Anybody know how to go about getting the molecular mass of this unknown acid?
Also, when trying to calculate Ka im getting stuck on this problem. Ka=[H+][A-]/[HA] and [H+]=[A-] so if the moles of base used was 3.842 x 10^-3, that equals the concentration of both [H+] and [A-]? So that would then give me Ka=(3.842 x 10^-3)(3.842 x 10^-3)/[HA]? How can i then solve for [HA] and then Ka?

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Chemistry Lab Final...Acid/Base pKa Calculation....Please Help!?

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