A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Kal = 6.3x10-3 Ka2 =6.3 x 10-8 and Ka3 =5 x 10-13 for H3PO4.

A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Kal = 6.3x10-3 Ka2 =6.3 x 10-8 and Ka3 =5 x 10-13 for H3PO4.

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

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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