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TABLE 2.6 Some weak acids and their conjugate bases Acid (Proton Donor) Conjugate Base (Proton Acceptor) pKa Ka (M) HCOOH HCOO- +H+ 3.75 1.78 x 10-4 Formic acid Formate ion CH;COOH Acetic acid CH3CO0- Acetate ion +H+ 4.76 1.74 x 10-5 OH OH +H+ 3.86 1.38 x 10-4 CH,CH-Co0- CH3CH-COOH Lactic acid Lactate ion H3PO4 Phosphoric acid H,PO, Dihydrogen phosphate ion +H+ 2.14 7.24 x 10-3 H,PO, Dihydrogen phosphate ion HPO,?- Monohydrogen phosphate ion +H+ 6.86 1.38 x 10-7 HPO- Monohydrogen phosphate ion PO,- Phosphate ion +H+ 12.4 3.98 x 10-13 H,CO3 Carbonic acid HCO,- Bicarbonate ion +H+ 6.3* 5.1 x 10-7* HCO,- Bicarbonate ion co?- Carbonate ion +H* 10.25 5.62 x 10-11 C6H5OH Phenol +H+ 9.89 1.29 x 10-10 Phenolate ion NH3 Ammonia +H+ 9.25 5.62 x 10-10 Ammonium ion "Apparent pk, and K. values (see text for explanation). 1 1

TABLE 2.6 Some weak acids and their conjugate bases Acid (Proton Donor) Conjugate Base (Proton Acceptor) pKa Ka (M) HCOOH HCOO- +H+ 3.75 1.78 x 10-4 Formic acid Formate ion CH;COOH Acetic acid CH3CO0- Acetate ion +H+ 4.76 1.74 x 10-5 OH OH +H+ 3.86 1.38 x 10-4 CH,CH-Co0- CH3CH-COOH Lactic acid Lactate ion H3PO4 Phosphoric acid H,PO, Dihydrogen phosphate ion +H+ 2.14 7.24 x 10-3 H,PO, Dihydrogen phosphate ion HPO,?- Monohydrogen phosphate ion +H+ 6.86 1.38 x 10-7 HPO- Monohydrogen phosphate ion PO,- Phosphate ion +H+ 12.4 3.98 x 10-13 H,CO3 Carbonic acid HCO,- Bicarbonate ion +H+ 6.3* 5.1 x 10-7* HCO,- Bicarbonate ion co?- Carbonate ion +H* 10.25 5.62 x 10-11 C6H5OH Phenol +H+ 9.89 1.29 x 10-10 Phenolate ion NH3 Ammonia +H+ 9.25 5.62 x 10-10 Ammonium ion "Apparent pk, and K. values (see text for explanation). 1 1

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter15: Solutions Of Acids And Bases
Section: Chapter Questions
Problem 15.23QE
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A biochemical reaction takes place in a 1.00 ml solution of 0.0250 M
phosphate buffer initially at pH = 7.20 (as shown for pKas of phosphate
species).
(a) Are the concentrations of any of the four possible phosphate species
negligible? If so, identify them and explain your answer.
(b) During the reaction, 3.80 μmol of HCl are produced. Calculate the final
pH of the reaction solution. Assume that the HCl is completely neutralized
by the buffer.

TABLE 2.6 Some weak acids and their conjugate bases Acid (Proton Donor) Conjugate Base (Proton Acceptor) pKa Ka (M) HCOOH HCOO- +H+ 3.75 1.78 x 10-4 Formic acid Formate ion CH;COOH Acetic acid CH3CO0- Acetate ion +H+ 4.76 1.74 x 10-5 OH OH +H+ 3.86 1.38 x 10-4 CH,CH-Co0- CH3CH-COOH Lactic acid Lactate ion H3PO4 Phosphoric acid H,PO, Dihydrogen phosphate ion +H+ 2.14 7.24 x 10-3 H,PO, Dihydrogen phosphate ion HPO,?- Monohydrogen phosphate ion +H+ 6.86 1.38 x 10-7 HPO- Monohydrogen phosphate ion PO,- Phosphate ion +H+ 12.4 3.98 x 10-13 H,CO3 Carbonic acid HCO,- Bicarbonate ion +H+ 6.3* 5.1 x 10-7* HCO,- Bicarbonate ion co?- Carbonate ion +H* 10.25 5.62 x 10-11 C6H5OH Phenol +H+ 9.89 1.29 x 10-10 Phenolate ion NH3 Ammonia +H+ 9.25 5.62 x 10-10 Ammonium ion "Apparent pk, and K. values (see text for explanation). 1 1
Transcribed Image Text:TABLE 2.6 Some weak acids and their conjugate bases Acid (Proton Donor) Conjugate Base (Proton Acceptor) pKa Ka (M) HCOOH HCOO- +H+ 3.75 1.78 x 10-4 Formic acid Formate ion CH;COOH Acetic acid CH3CO0- Acetate ion +H+ 4.76 1.74 x 10-5 OH OH +H+ 3.86 1.38 x 10-4 CH,CH-Co0- CH3CH-COOH Lactic acid Lactate ion H3PO4 Phosphoric acid H,PO, Dihydrogen phosphate ion +H+ 2.14 7.24 x 10-3 H,PO, Dihydrogen phosphate ion HPO,?- Monohydrogen phosphate ion +H+ 6.86 1.38 x 10-7 HPO- Monohydrogen phosphate ion PO,- Phosphate ion +H+ 12.4 3.98 x 10-13 H,CO3 Carbonic acid HCO,- Bicarbonate ion +H+ 6.3* 5.1 x 10-7* HCO,- Bicarbonate ion co?- Carbonate ion +H* 10.25 5.62 x 10-11 C6H5OH Phenol +H+ 9.89 1.29 x 10-10 Phenolate ion NH3 Ammonia +H+ 9.25 5.62 x 10-10 Ammonium ion "Apparent pk, and K. values (see text for explanation). 1 1
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