Question

How do I calcualte and what would my titration curve look like for a 25mL 0.1M H3PO4 solution titrated with 0.1M NaOh.
The problem involves Ka and pKa values which i have, not sure how to use this information and make a graph out of it?

Answer 1

The first one is more useful than the second one, I think, for your purposes.
http://www.dartmouth.edu/~chemlab/chem3-5/acid1/full_text/chemistry.html

This second one, if you will scroll down about half-way, has the curve you are looking for with the end points as well as the mid-points marked.

http://www.chem.usu.edu/~sbialkow/Classes/3600/Overheads/H3A/H3A.html