Posted by Daniel on Wednesday, September 5, 2012 at 8:41pm.
Use the Henderson-Hasselbalch equation.
pH = pKa + log (base)/(acid).
Thank you, but I guess what my question should have been is what is the acid in this question and what is the base. I would assume that both H2PO4 and HPO4 are acids and phosphate is the base but Im not sure.
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