Some acids are polyprotic, meaning that they have two or more acidic protons in their formula.  Phosphoric acid is an example of a triprotic acid, meaning that it has three acidic protons.  The third equivalence point would be the volume of base required to neutralize all three-- the first, second, and third protons of the acid's formula.  The calculation for the following problem will require the correct stoichiometry for this acid-base neutralization reaction to be used.  Hint: Be careful about your molar ratio.   How many mL of 0.101 M NaOH solution do we need to titrate 0.0250 L of 0.103 M H3PO4(aq) and reach the second equivalence point?

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Some acids are polyprotic, meaning that they have two or more acidic protons in their formula.  Phosphoric acid is an example of a triprotic acid, meaning that it has three acidic protons.  The third equivalence point would be the volume of base required to neutralize all three-- the first, second, and third protons of the acid's formula.  The calculation for the following problem will require the correct stoichiometry for this acid-base neutralization reaction to be used.  Hint: Be careful about your molar ratio.

 

How many mL of 0.101 M NaOH solution do we need to titrate 0.0250 L of 0.103 M H3PO4(aq) and reach the second equivalence point?

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