A 0.7500 g sample of a phosphoric acid (H3PO4) solution with unknown concentration requires 30.00 mL of 0.3375 M NaOH to reach the end point. Calculate the %(m/m) concentration of the phosphoric acid in the unknown solution. H3PO4(aq) + 3NaOH(aq)---> K3PO4(aq) + 3H2O(l)

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter4: Types Of Chemical Reactions And Solution Stoichiometry
Section: Chapter Questions
Problem 47E
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A 0.7500 g sample of a phosphoric acid (H3PO4) solution with unknown concentration requires 30.00 mL of 0.3375 M NaOH to reach the end point. Calculate the %(m/m) concentration of the phosphoric acid in the unknown solution. 

H3PO4(aq) + 3NaOH(aq)---> K3PO4(aq) + 3H2O(l) 

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