Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7? Ionization Constants for Aqueous Weak Acids at 25 °C Acid K. (pK,) Conjugate Base Hydrogen phthalate ion, Cg H4(CO2H)(CO2) Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74) Weak Acid Phthalic acid, C6 H4 (CO,H)2 1.3 x 10-3 (2.89) Dihydrogen phosphate Hydrogen phosphate ion, H2 PO4 Hydrogen phosphate ion, HPO42 6.2 x 10-8 (7.21) ion, HPO,2- Phosphate ion, PO,* 3.6 x 10-13 (12.44) O Na, HPO4 and NagPO4 O NaH2 PO4 and NazHPO4 O H;PO4 and NaH2 PO4
Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7? Ionization Constants for Aqueous Weak Acids at 25 °C Acid K. (pK,) Conjugate Base Hydrogen phthalate ion, Cg H4(CO2H)(CO2) Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74) Weak Acid Phthalic acid, C6 H4 (CO,H)2 1.3 x 10-3 (2.89) Dihydrogen phosphate Hydrogen phosphate ion, H2 PO4 Hydrogen phosphate ion, HPO42 6.2 x 10-8 (7.21) ion, HPO,2- Phosphate ion, PO,* 3.6 x 10-13 (12.44) O Na, HPO4 and NagPO4 O NaH2 PO4 and NazHPO4 O H;PO4 and NaH2 PO4
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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
Transcribed Image Text:Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7?
Ionization Constants for Aqueous Weak Acids at 25 °C
Acid K. (pK,)
Conjugate Base
Hydrogen phthalate ion,
Cg H4(CO2H)(CO2)
Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74)
Weak Acid
Phthalic acid,
C6 H4 (CO,H)2
1.3 x 10-3 (2.89)
Dihydrogen phosphate Hydrogen phosphate
ion, H2 PO4
Hydrogen phosphate
ion, HPO42
6.2 x 10-8 (7.21)
ion, HPO,2-
Phosphate ion, PO,*
3.6 x 10-13 (12.44)
O Na, HPO4 and NagPO4
O NaH2 PO4 and NazHPO4
O H;PO4 and NaH2 PO4
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