Page 12
7. Appendices
7.1 pH Buffer Values Vs Temperature
The following table lists the pH values of some popular buffers, with respect to
Temperature. Any pH meter should always be calibrated to the correct value of
the buffers at the current solution temperature.
Buffer temperature should not exceed 50oC during calibration.
Temp
O
C
pH4.01
pH6.86
pH7.00
pH9.18
pH10.01
0
4.00
6.98
7.13
9.46
10.32
5
4.00
6.95
7.09
9.40
10.25
10
4.00
6.92
7.06
9.33
10.18
15
4.00
6.90
7.04
9.28
10.12
20
4.00
6.88
7.02
9.23
10.06
25
4.01
6.86
7.00
9.18
10.01
30
4.01
6.85
6.99
9.14
9.97
35
4.02
6.84
6.98
9.10
9.93
40
4.03
6.84
6.97
9.07
9.89
45
4.04
6.83
6.97
9.04
9.86
50
4.05
6.83
6.97
9.01
9.83
