Question

practice exam...not sure how to do this

A solution contains 10.0 mmol of H3PO4 and 5.0 mmol of NaH2PO4. How many millimeters of 0.10 M NaOH must be added to reach the second equivilence point of the titration of the H3PO4 with NaOH?
It will take 10 mmols NaOH to convert 10 mmoles H3PO4 to NaH2PO4 and another 10 to convert to Na2HPO4 plus 5 mmoles to convert 5 mmole NaH2PO4 to Na2HPO4. That's a total of 25 mmoles needed. You hav e 0.1M NaOH, M = mmoles/mL. Substitute and solve for mL. NOTE: it's milliliters and not millimeters. Millimeters is a unit of length.
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