132 / 912
124 Special Topic I
Copyright © 2017 Pearson Education, Inc.
Solutions to Problems on pH,
p
K
a
,
and Buffers
1.
a.
pH
=
-
log
1
1
*
10
-
3
2
pH
=
3
b.
pH
=
-
log 0.60
pH
=
0.22
c.
pH
=
-
log
1
1.40
*
10
-
2
2
pH
=
1.85
d.
pOH
=
-
log
1
1
*
10
-
3
2
pOH
=
3
pH
=
14
-
3
=
11
e.
pOH
=
-
log
1
3.70
*
10
-
4
2
pOH
=
3.43
pH
=
10.57
f.
p
K
a
=
4.23,
K
a
=
5.89
*
10
-
5
K
x
x
x
a
5
2
2
5
3
H A
HA
5.89 10
1.20
7.07 10
8.41 10
pH 2
=
[ ]
×
=
= ×
= ×
=
+ −
−
−
−
[ ] [ ]
.08
g.
K
K
K
w
a
a
HO HA
A
=
[ ]
=
= ×
−
−
−
−
[
]
[ ]
(
.
)
.
10
1 74 10
4 76
5
1 0 10
1 74 10
1 60 10
5 75 10
1 60 10
9 2
14
5
2
2
10
2
2
2
.
.
.
.
.
.
×
×
=
×
×
=
×
=
−
−
−
−
−
x
x
x
0 10
3 03 10
5 52
14 00 5 52 8 48
12
6
×
= ×
=
=
− =
−
−
x
.
.
.
.
.
pOH
pH