4. Phosphoric acid is a triprotic weak acid with chemical formula H3PO4. Atomic masses of H, O, and P are 1, 16, 30.97, respectively. (I ppm = Img/L) (20/100) i. Calculate the molar concentration of a 5 ppm solution of phosphoric acid. ii. Calculate the equivalent weight of phosphoric acid? ii. What is the normal concentration of the phosphoric acid in part (a)? iv. Calculate the alkalinity in "meq/L" for this phosphoric acid solution after adjusting solution pH to 12, where the dominant forms of phosphoric acid ions are HPO?- and PO- each amounting to 50% of the total phosphorous in the system, with negligible fractions of H3PO, and H2PO,.

4. Phosphoric acid is a triprotic weak acid with chemical formula H3PO4. Atomic masses of H, O, and P are 1, 16, 30.97, respectively. (I ppm = Img/L) (20/100) i. Calculate the molar concentration of a 5 ppm solution of phosphoric acid. ii. Calculate the equivalent weight of phosphoric acid? ii. What is the normal concentration of the phosphoric acid in part (a)? iv. Calculate the alkalinity in "meq/L" for this phosphoric acid solution after adjusting solution pH to 12, where the dominant forms of phosphoric acid ions are HPO?- and PO- each amounting to 50% of the total phosphorous in the system, with negligible fractions of H3PO, and H2PO,.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Question

4. Phosphoric acid is a triprotic weak acid with chemical formula H3PO4. Atomic masses of H, O, and P
are 1, 16, 30.97, respectively. (I ppm = Img/L) (20/100)
i.
Calculate the molar concentration of a 5 ppm solution of phosphoric acid.
ii.
Calculate the equivalent weight of phosphoric acid?
ii.
What is the normal concentration of the phosphoric acid in part (a)?
iv.
Calculate the alkalinity in "meq/L" for this phosphoric acid solution after adjusting solution pH
to 12, where the dominant forms of phosphoric acid ions are HPO?- and PO- each amounting
to 50% of the total phosphorous in the system, with negligible fractions of H3PO, and H2PO,.

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