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Calculate the pH: - 0.20 M arginine  hydrochloride -  50.0 mLs of 0.10 M arginine hydrochloride to which 50.0 mLs of 0.10 M NaOH have been added.

Calculate the pH: - 0.20 M arginine  hydrochloride -  50.0 mLs of 0.10 M arginine hydrochloride to which 50.0 mLs of 0.10 M NaOH have been added.

Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter21: Biochemistry
Section: Chapter Questions
Problem 11QAP
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Calculate the pH:

- 0.20 M arginine  hydrochloride

-  50.0 mLs of 0.10 M arginine hydrochloride to which 50.0 mLs of 0.10 M NaOH have been added.

Name Structure K, Acetic acid CH,CO,H 4.756 1.75 x 10-5 (ethanoic acid) NH Alaninc CHCH, 2.344 (CO,H) 9.868 (NH,) 4.53 X 10-3 CO,H 1.36 X 10-10 Aminobenzene - NH 4.601 2.51 X 10-5 (aniline) 4-Aminobenzenesulfonic acid (sulfanilic acid) - NH 3.232 5.86 x 10-4 NH 2-Aminobenzoic acid 2.08 (CO,H) 4.96 (NH,) 8.3 X 10-3 1.10 x 10-s (anthranilic acid) CO,H 2-Aminocthanethiol (2-mercaptoethylamine) HSCH,CH,NH; 8.21 (SH) (u = 0.1) 10.73 (NH,) (p = 0.1) 6.2 x 10-9 1.86 X 10-11 2-Aminocthanol HOCH,CH,NH 9.498 3.18 X 10-10 (ethanolamine) 4.70 (NH3) (20°) 9.97 (OH) (20°) 2.0 X 10-3 1.05 x 10-10 2-Aminophenol `NH Ammonia NH 9.245 5.69 х 10-10 NH NH CHCH,CH,CH,NHC 1.823 (CO,H) 8.991 (NH,) (12.1) (NH,) ( = 0.1) 1.50 x 10-2 Arginine 1.02 X 10-9 8 x 10-13 NH, 2.31 4.9 x 10-3 8.9 x 10-8 1.3 x 10-12 Arsenic acid но-As — ОН 7.05 (hydrogen arsenate) 11.9 OH Arsenious acid As(OH); 9.29 5.1 X 10-10 (hydrogen arsenite) NH: 0 || CHCH,CNH, co,H Asparagine 2.16 (CO,H) (р. %3D0.1) 8.73 (NH;) (µ. - 0.1) 6.9 X 10-3 1.86 x 10-9. *Each acid is written in its protonated form. The acidic protons are indicated in bold type. tpK, values refer to 25°C and zero ionic strength unless otherwise indicated. Values in parentheses are considered to be less reliable. Data are from A. E. MartelI, R. M. Smith, and R. J. Motekaitis, NIST Database 46 (Gaithersburg, MD: National Instinute zdards and Technology, 2001). FT'ne accurate way to calculate K, for the conjugate base is pK, = 13.995 - pK, and K, = 10-pks,
Transcribed Image Text:Name Structure K, Acetic acid CH,CO,H 4.756 1.75 x 10-5 (ethanoic acid) NH Alaninc CHCH, 2.344 (CO,H) 9.868 (NH,) 4.53 X 10-3 CO,H 1.36 X 10-10 Aminobenzene - NH 4.601 2.51 X 10-5 (aniline) 4-Aminobenzenesulfonic acid (sulfanilic acid) - NH 3.232 5.86 x 10-4 NH 2-Aminobenzoic acid 2.08 (CO,H) 4.96 (NH,) 8.3 X 10-3 1.10 x 10-s (anthranilic acid) CO,H 2-Aminocthanethiol (2-mercaptoethylamine) HSCH,CH,NH; 8.21 (SH) (u = 0.1) 10.73 (NH,) (p = 0.1) 6.2 x 10-9 1.86 X 10-11 2-Aminocthanol HOCH,CH,NH 9.498 3.18 X 10-10 (ethanolamine) 4.70 (NH3) (20°) 9.97 (OH) (20°) 2.0 X 10-3 1.05 x 10-10 2-Aminophenol `NH Ammonia NH 9.245 5.69 х 10-10 NH NH CHCH,CH,CH,NHC 1.823 (CO,H) 8.991 (NH,) (12.1) (NH,) ( = 0.1) 1.50 x 10-2 Arginine 1.02 X 10-9 8 x 10-13 NH, 2.31 4.9 x 10-3 8.9 x 10-8 1.3 x 10-12 Arsenic acid но-As — ОН 7.05 (hydrogen arsenate) 11.9 OH Arsenious acid As(OH); 9.29 5.1 X 10-10 (hydrogen arsenite) NH: 0 || CHCH,CNH, co,H Asparagine 2.16 (CO,H) (р. %3D0.1) 8.73 (NH;) (µ. - 0.1) 6.9 X 10-3 1.86 x 10-9. *Each acid is written in its protonated form. The acidic protons are indicated in bold type. tpK, values refer to 25°C and zero ionic strength unless otherwise indicated. Values in parentheses are considered to be less reliable. Data are from A. E. MartelI, R. M. Smith, and R. J. Motekaitis, NIST Database 46 (Gaithersburg, MD: National Instinute zdards and Technology, 2001). FT'ne accurate way to calculate K, for the conjugate base is pK, = 13.995 - pK, and K, = 10-pks,
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