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pH and pOH Calculations
• The values on the pH scale are derived by the mathematical conversion of the H
+
ion concentration to pH values.
pH
=
 log[H
+
]
• Solutions that contain
more
H
+
ions than OH

ions are
acidic
and have pH values
less than 7.
• Solutions that contain
less
H
+
ions than OH

ions are
basic
and have pH values
greater than 7
•
Calculate the pH of a solution if [H
+
] = 2 x 10
5
M.
pH
=
5 – log 2
The 5 is the
exponent
from the original concentration.
=
5 – 0.30
=
4.7
1.
Find the pH of solutions with the following H
+
concentrations.
Tell whether the solution is
acidic
,
basic
or
neutral
.
a) 1.15 x 10
6
M
5.94
acidic
b) 5.75 x 108 M
7.24
basic
c) 7.44 x 1011 M
10.13
basic
d) 5.11 x 103 M
2.29
acidic
e) 7.57 x 109 M
8.12
basic
f)
6.2 x 1012 M
11.21
basic
2. Find the [H+] and the pOH of the following solutions (remember:
pH
+
pOH
=
14).
a) pH
=
3
1.0 x 103M
11
b) pH
=
9
1.0 x 109M
5
c) pH
=
6
1.0 x 106M
8
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Calculate the [H
+
] when you have a pH of 8.3
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 Spring '10
 mrdavidbyrum
 Chemistry, pH

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