I don't get it at all. I struggled with the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0. Can you help me to explain to me the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0? Can you help me to explain to me?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter14: Acids And Bases
Section14.8: Acid-base Reactions Of Salts
Problem 14.21CE
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I don't get it at all. I struggled with the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0. Can you help me to explain to me the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0? Can you help me to explain to me?

13.4) In the previous problem, you drew the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0. These structures
are shown below. What is the total charge of leucine at pH = 1.0, pH = 7.4, and pH = 12.0?
H-
H
H
pH = 1.0
H :0:
I
||
C
C-O-H
|
CH₂
T
CHCH3
I
CH3
total charge = 1+
There is a formal charge of 1+ on the
nitrogen.
physiological pH (pH = 7.4)
H H
:O:
||
C C
T
H-N
I
H
CH₂
|
CHCH3
|
CH3
total charge =0
-0:
There is a formal charge of 1+ on the
nitrogen, and a formal charge of 1- on
the oxygen. Adding these charges give
a total charge = 0.
pH = 12.0
H :0:
|
H-N-C
|
H
T
CH₂
T
||
C.
CHCH3
|
CH3
total charge = 1-
There is a formal charge of 1- on the
oxygen.
Transcribed Image Text:13.4) In the previous problem, you drew the predominant form of leucine at pH = 1.0, pH = 7.4, and pH = 12.0. These structures are shown below. What is the total charge of leucine at pH = 1.0, pH = 7.4, and pH = 12.0? H- H H pH = 1.0 H :0: I || C C-O-H | CH₂ T CHCH3 I CH3 total charge = 1+ There is a formal charge of 1+ on the nitrogen. physiological pH (pH = 7.4) H H :O: || C C T H-N I H CH₂ | CHCH3 | CH3 total charge =0 -0: There is a formal charge of 1+ on the nitrogen, and a formal charge of 1- on the oxygen. Adding these charges give a total charge = 0. pH = 12.0 H :0: | H-N-C | H T CH₂ T || C. CHCH3 | CH3 total charge = 1- There is a formal charge of 1- on the oxygen.
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