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: Principles and Reactions
8th Edition
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Author:William L. Masterton, Cecile N. Hurley
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Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 49QAP: Consider the titration of butyric acid (HBut) with sodium hydroxide. In an experiment, 50.00 mL of...
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Which combination can be used to make a buffer with a pH of 4.2? The K, of benzoic acid, C6H5COOH, is 6.5×10-5 and
the Ka of hydrocyanic acid, HCN, is 4.9x10-10.
Item equation/constant:
A
pH=pK, +log
НА
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 0.500 M sodium hydroxide.
O c. 50.0 mL of 0.500 M C 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.
Transcribed Image Text:Which combination can be used to make a buffer with a pH of 4.2? The K, of benzoic acid, C6H5COOH, is 6.5×10-5 and the Ka of hydrocyanic acid, HCN, is 4.9x10-10. Item equation/constant: A pH=pK, +log НА 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 0.500 M sodium hydroxide. O c. 50.0 mL of 0.500 M C 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.
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