23. Which of the following combinations would be best to buffer an aqueous solution at a pH of 7.42? a) H3PO4 and H,PO, Ka1 = 7.5 x 103 b) HNO2 and NO2", K, = 4.5 x 10 c) CH3CO2H and CH3COO", K, = 1.8 x 10-5 d) H2PO4 and HPO,, Ka2 = 6.2 x 10 e) NHa and NH3, K, 5.7 x 10-10 f) none of the above %3D

Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter8: Acids And Bases
Section: Chapter Questions
Problem 8.74P
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23. Which of the following combinations would be best to buffer an aqueous solution at a pH of 7.42?
a) H3PO4 and H2PO4¯, Ka1 = 7.5 × 10-3
b) HNO2 and NO2", Ka = 4.5 x 10
c) CH3CO2H and CH3COO", Ka = 1.8 x 10-s
d) H2PO4¯ and HPO4²¯, Ka2 = 6.2 × 108
e) NH4* and NH3, K, = 5.7 × 10¬10
f) none of the above
%3D
%3D
%3D
%3D
Transcribed Image Text:23. Which of the following combinations would be best to buffer an aqueous solution at a pH of 7.42? a) H3PO4 and H2PO4¯, Ka1 = 7.5 × 10-3 b) HNO2 and NO2", Ka = 4.5 x 10 c) CH3CO2H and CH3COO", Ka = 1.8 x 10-s d) H2PO4¯ and HPO4²¯, Ka2 = 6.2 × 108 e) NH4* and NH3, K, = 5.7 × 10¬10 f) none of the above %3D %3D %3D %3D
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