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110 Chapter 2
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10.
Label the compounds in order of decreasing acidity. (Label the most acidic compound #1.)
CH
3
CH
2
OH CH
3
CH
2
NH
2
CH
3
CH
2
SH CH
3
CH
2
CH
3
11.
You are planning to carry out a reaction at
pH
=
4
that releases protons. Would it be better to use a 1.0 M
formic acid/sodium formate buffer or a 1.0 M acetic acid/sodium acetate buffer?
(The
p
K
a
of formic acid is 3.75; the
p
K
a
of acetic acid is 4.76.)
12.
Indicate whether each of the following statements is true or false.
a.
HO
-
is a stronger base than
-
NH
2
.
T
F
b.
A Lewis acid is a compound that accepts a share in a pair of electrons.
T
F
c.
CH
3
CH
3
is more acidic than
H
2
C
“
CH
2
.
T
F
d.
The weaker the acid, the more stable the conjugate base.
T
F
e.
The larger the
p
K
a
, the weaker the acid.
T
F
f.
The weaker the base, the more stable it is.
T
F
ANSWERS TO ALL THE PRACTICE TESTS CAN BE FOUND AT THE END OF
THE SOLUTIONS MANUAL.