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?
2 answers
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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2 answers