Arginine has ionizable groups with pKa values of 2.17, 9.04, and 12.48. A researcher makes up 73 mL of a 0.125 M solution of arginine at a pH = 8.5. He then adds 35 mL of 0.24 M NaOH. What is the pH of the resulting solution? %3D

Arginine has ionizable groups with pKa values of 2.17, 9.04, and 12.48. A researcher makes up 73 mL of a 0.125 M solution of arginine at a pH = 8.5. He then adds 35 mL of 0.24 M NaOH. What is the pH of the resulting solution? %3D

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter23: Organic Polymers, Natural And Synthetic

Section: Chapter Questions

Problem 29QAP: For alanine, Ka1=5.1105,Ka2=1.81010 . Calculate the ratios [Z]/[C+] and [Z]/[A+] at pH (a) 2.00. (b)...

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Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

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Arginine has ionizable groups with pKa values
of 2.17, 9.04, and 12.48. A researcher makes up
73 mL of a 0.125 M solution of arginine at a pH
= 8.5. He then adds 35 mL of 0.24 M NaOH.
What is the pH of the resulting solution?
%3D

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Arginine has ionizable groups with pKa values of 2.17, 9.04, and 12.48. A researcher makes up 73 mL of a 0.125 M solution of arginine at a pH = 8.5. He then adds 35 mL of 0.24 M NaOH. What is the pH of the resulting solution?
The pKa values of an amino acid are the following: pK1 = 2.18; pK2 = 8.95; pK3 = 10.53, what is the isoelectric point of the amino acid? Show the solution and express the your answer in three significant figures.
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Q1)In the pH range 1.82 to 8.99, H2Arg+ is the principal form of arginine. Which is the second most prominent species at pH 6.0? At pH 5.0?Q2) (a) Draw the structure of the predominant form (principal species) of 1,3-dihydroxybenzene at pH 9.00 and at pH 11.00.(b) What is the second most prominent species at each pH?(c) Calculate the percentage in the major form at each pH
For the amino acid alanine, the major species in solution at pH 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a p?apKa of 3.3. The amino group of alanine has a p?apKa of 8.8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7.
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