Tris(hydroxymethyl)aminomethane [(HOCH2)3CNH2, or "Tris" for short] acts as a Brønsted- Lowry base (pK, = 5.92 at 25°C). Tris and TrisHCI are often combined to make a buffer in biochemical laboratories. %3D (a) At what pH do Tris buffers behave optimally (i.e., have equal capacity to neutralize acid and base additions)? (b) Tris buffer is normally used between pH values of 7.0 and 9.0. Calculate the ratio [Tris]/[TrisH+] at the extremes of the range. (c) A buffer is prepared by diluting 50.0 g Tris base and 65.0 g TrisHCI to a total volume of 2.0 L. What is the pH of the buffer? (d) What is the pH after 0.50 mL of 12 M HCI is added to a 200.0-mL portion of the buffer in part (c)?

Tris(hydroxymethyl)aminomethane [(HOCH2)3CNH2, or "Tris" for short] acts as a Brønsted- Lowry base (pK, = 5.92 at 25°C). Tris and TrisHCI are often combined to make a buffer in biochemical laboratories. %3D (a) At what pH do Tris buffers behave optimally (i.e., have equal capacity to neutralize acid and base additions)? (b) Tris buffer is normally used between pH values of 7.0 and 9.0. Calculate the ratio [Tris]/[TrisH+] at the extremes of the range. (c) A buffer is prepared by diluting 50.0 g Tris base and 65.0 g TrisHCI to a total volume of 2.0 L. What is the pH of the buffer? (d) What is the pH after 0.50 mL of 12 M HCI is added to a 200.0-mL portion of the buffer in part (c)?

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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