Since the given reaction is already balanced, we can do a mole to mole comparison to calculate the number of moles of KOH to react with H3PO4 then calculate the volume of KOH solution needed.
How many milliliters of a 0.1500-M solution of KOH will be required to titrate 40.00 mL of a 0.0656-M solution of H3PO4?
H3PO4(aq) + 2KOH(aq) ⟶ K2HPO4(aq) + 2H2O(l)
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Our data indicates that this problem or a close variation was asked in Chemistry - OpenStax 2015th Edition. You can also practice Chemistry - OpenStax 2015th Edition practice problems.