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At which pH value does the amino group of amino acid have the best buffering capacity? 9.00 9.69 1.53 6.01 3.00 10.5 E. What is the pI (isoelectric point)? pI=

At which pH value does the amino group of amino acid have the best buffering capacity? 9.00 9.69 1.53 6.01 3.00 10.5 E. What is the pI (isoelectric point)? pI=

Biochemistry
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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This is all part of one question. It goes together. (I wrote D and E that were cut off from the picture.) Please help me solve this since it all follows a line.

D. At which pH value does the amino group of amino acid have the best buffering capacity?
9.00
9.69
1.53
6.01
3.00
10.5

E. What is the pI (isoelectric point)?
pI=

The graph represents the titration of an amino acid with NaOH solution. A. At what pH are about 1/2 of the carboxyl groups ionized? pH = 6.015 Incorrect B. Where does the amino acid have a net charge of -1? 12 11 10 9 8 7 6. 5 4 3 دیا N 1 0 T I I pl = 6.01 PK₁ = 2.34 0.5 1.0 pK₂ = 9.69 1.5 OH-(equivalents) 2.0
Transcribed Image Text:The graph represents the titration of an amino acid with NaOH solution. A. At what pH are about 1/2 of the carboxyl groups ionized? pH = 6.015 Incorrect B. Where does the amino acid have a net charge of -1? 12 11 10 9 8 7 6. 5 4 3 دیا N 1 0 T I I pl = 6.01 PK₁ = 2.34 0.5 1.0 pK₂ = 9.69 1.5 OH-(equivalents) 2.0
B. Where does the amino acid have a net charge of -1? above pH 9.69 at pH = 9.69 at pH = 6.01 at pH = 2.34 below pH 2.34 C. At what point has enough base been added to react with 1/2 of the NH3 groups? 1/2 of NH3 reacted = 7.85 Incorrect when 1/2 of NH has reacted, the pH = 7.85 Incorrect D. At which pH value does the amino group of amino acid have the best buffering capacity? equivalents OH
Transcribed Image Text:B. Where does the amino acid have a net charge of -1? above pH 9.69 at pH = 9.69 at pH = 6.01 at pH = 2.34 below pH 2.34 C. At what point has enough base been added to react with 1/2 of the NH3 groups? 1/2 of NH3 reacted = 7.85 Incorrect when 1/2 of NH has reacted, the pH = 7.85 Incorrect D. At which pH value does the amino group of amino acid have the best buffering capacity? equivalents OH
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