Which combination can be used to make a buffer with a pH of 4.2? The Ka of benzoic acld, the Ka of hydrocyanic acid, HCN, is 4.9x10-10. Item equation/constant: A pH=pK. +log | HA Select one: O a. 50.0 mL of 0.500 M HCN and 50.0 mL of 0.500 M sodium hydroxide. O b. 50.0 mL of 0.500 M C6H;COOH and 25.0 mL of 0.500M sodium hydroxide. O c. 50.0 mL of 0.500 M OC&H5COOH and 50.0 mL of 0.500 M sodium hydroxide. O d. 50.0 mL of 0.500 M HCN and 25.0 mL of 0.500 M sodium hydroxide.

Which combination can be used to make a buffer with a pH of 4.2? The Ka of benzoic acld, the Ka of hydrocyanic acid, HCN, is 4.9x10-10. Item equation/constant: A pH=pK. +log | HA Select one: O a. 50.0 mL of 0.500 M HCN and 50.0 mL of 0.500 M sodium hydroxide. O b. 50.0 mL of 0.500 M C6H;COOH and 25.0 mL of 0.500M sodium hydroxide. O c. 50.0 mL of 0.500 M OC&H5COOH and 50.0 mL of 0.500 M sodium hydroxide. O d. 50.0 mL of 0.500 M HCN and 25.0 mL of 0.500 M sodium hydroxide.

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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