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Which of the following combinations of acids and conjugate bases would be the best to create a pH 7.0 buffer? Group of answer choices A.) H2PO4- (Ka = 6.2 X 10-8) and HPO42- B.) H3PO4 (Ka = 7.5 X 10-3) and H2PO4- C.) HNO2 (Ka = 4.5 X 10-4) and NO2- D.) NH4+ (Ka = 5.7 X 10-10) and NH3

Which of the following combinations of acids and conjugate bases would be the best to create a pH 7.0 buffer? Group of answer choices A.) H2PO4- (Ka = 6.2 X 10-8) and HPO42- B.) H3PO4 (Ka = 7.5 X 10-3) and H2PO4- C.) HNO2 (Ka = 4.5 X 10-4) and NO2- D.) NH4+ (Ka = 5.7 X 10-10) and NH3

Introductory Chemistry For Today
Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
Publisher:Seager
Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.117E
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Which of the following combinations of acids and conjugate bases would be the best to create a pH 7.0 buffer?
Group of answer choices
A.) H2PO4- (Ka = 6.2 X 10-8) and HPO42-
B.) H3PO4 (Ka = 7.5 X 10-3) and H2PO4-
C.) HNO2 (Ka = 4.5 X 10-4) and NO2-
D.) NH4+ (Ka = 5.7 X 10-10) and NH3
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