Chemical Principles in the Laboratory
11th Edition
ISBN: 9781305264434
Author: Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher: Brooks Cole
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Textbook Question
Chapter 25, Problem 3ASA
The pH of a 0.10 MHOBr solution is 4.8.
- What is [H+] in that solution? ____________M
- What is [OBr-]? What is [HOBr]? (Where do the H+ and OBr- ions comes from?) ____________M; ____________M
- What is the value of Ka for HOBr? What is the value of pKa?____________ ____________
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Q1: Draw the most stable and the least stable Newman projections about the C2-C3 bond for
each of the following isomers (A-C). Are the barriers to rotation identical for enantiomers A and
B? How about the diastereomers (A versus C or B versus C)?
H Br
H Br
(S) CH3
(R) CH3
H3C (S)
H3C
H Br
Br
H
A
C
enantiomers
H Br
H Br
(R) CH3
H3C (R)
(S) CH3
H3C
H Br
Br H
B
D
identical
2. Histamine (below structure) is a signal molecule involved in immune response and is
a neurotransmitter. Histamine features imidazole ring which is an aromatic heterocycle.
Please answer the following questions regarding Histamine.
b
a
HN
=N
C
NH2
a. Determine hybridization of each N atom (s, p, sp, sp², sp³, etc.) in histamine
N-a hybridization:
N-b hybridization:
N-c hybridization:
b. Determine what atomic orbitals (s, p, sp, sp², sp³, etc.) of the lone pair of each N
atom resided in
N-a hybridization:
N-b hybridization:
N-c hybridization:
Chapter 25 Solutions
Chemical Principles in the Laboratory
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