2. A carbonate buffer of pH 10 is needed by a chemist. How many grams of Na,CO, is needed to dissolve in 1.5L of 0.2M NaHCO, to make the buffer? K, of HCO, = 4.7 x 1011 3. What weight of Na,HPO, and H,PO, would be required to prepare 200mL of a buffer solution of pH 7.40 that has an ionic strength of 0.2? pk, = 7.12 3 4 %3D 4. How many mL of 2.0M boric acid solution must be added to 600mL of a 0.01M sodium borate in order for the pH to be 9.45? pk, of H,BO, = 9.24 %3D a

2. A carbonate buffer of pH 10 is needed by a chemist. How many grams of Na,CO, is needed to dissolve in 1.5L of 0.2M NaHCO, to make the buffer? K, of HCO, = 4.7 x 1011 3. What weight of Na,HPO, and H,PO, would be required to prepare 200mL of a buffer solution of pH 7.40 that has an ionic strength of 0.2? pk, = 7.12 3 4 %3D 4. How many mL of 2.0M boric acid solution must be added to 600mL of a 0.01M sodium borate in order for the pH to be 9.45? pk, of H,BO, = 9.24 %3D a

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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