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Technical note
■
Technical note
● pH standard solutions at various temperatures
< USA >
Temp.
pH 2
(°C)
Oxalate
0
1.666
5
1.668
10
1.670
15
1.672
20
1.675
25
1.679
30
1.683
35
1.688
40
1.694
45
1.700
< NIST (pH 2, 4, 12 are common) >
Tip
The differences between NIST and USA standard solutions are a different pH7 value, and
the use of pH10 standard solution instead of pH9 standard solution in USA.
Note
Calibration is performed using Nernst's equation with the above values.
114
pH 7
pH 4
Neutral
Phthalate
phosphate
4.003
7.119
3.999
7.086
3.998
7.058
3.999
7.035
4.002
7.015
4.008
7.000
4.015
6.988
4.024
6.979
4.035
6.973
4.047
6.969
pH 7
Temp.
Neutral
(°C)
phosphate
0
6.984
5
6.951
10
6.923
15
6.900
20
6.881
25
6.865
30
6.853
35
6.844
40
6.838
45
6.834
pH 10
Saturated calcium
Carbonate
10.318
10.245
10.178
10.117
10.061
10.011
9.965
9.925
9.888
9.856
pH 9
Borate
9.464
9.395
9.332
9.276
9.225
9.180
9.139
9.102
9.068
9.038
pH 12
hydroxide
solution
13.423
13.207
13.003
12.810
12.627
12.454
12.289
12.133
11.984
11.841
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