February 25, 2017

Homework Help: Chemistry

Posted by Jenna on Friday, January 29, 2010 at 9:44am.

The phosphoric acid in a 100.00 mL sample of a cola drink was titrated with 0.1476 M NaOH. The first equivalence point was detected after 13.32 mL of base added, and the second equivalence point after 28.65 mL. Calculate the concentration of H2PO4- in mol/L. (Hint: if only H3PO4 were present, where would the second equivalence point be?)

I have tried using C1V1 = C2V2, using as many different combination of volumes as I can, but I can't get the answer ( I know what the answer is supposed to be and cannot come up with it)... I think I am missing something that's hidden within the hint but I don't know what that could be...any help would be appreciated.

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