### How many moles of dihydrogen phosphate ion

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In an acid/base titration, knowing that it took 13.14 mili litres of 0.1016 M sodium hydroxide, NaOH to reach the first endpoint of the titration,) from this information, mols of Phosphoric acid present in the sample is 1.335 mols. For the same titration that is given above, it took 28.05 mL to reach the second endpoint. determine how many mols of dihydrogen phosphate ion were present in the sample?

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