Technical note
66
●
pH standard solutions at various temperatures
< NIST >
< USA (pH 2, 4, 12 are common) >
Tip
The differences between NIST and USA standard solutions are a different pH 7 value, and
the use of pH 10 standard solution instead of pH 9 standard solution in USA.
Note
Calibration is performed using Nernst's equation with the above values.
Temp.
(
°C
)
pH 2
Oxalate
pH 4
Phthalate
pH 7
Neutral
phosphate
pH 9
Borate
pH 12
Saturated calcium
hydroxide solution
0
1.666
4.003
6.984
9.464
13.423
5
1.668
3.999
6.951
9.395
13.207
10
1.670
3.998
6.923
9.332
13.003
15
1.672
3.999
6.900
9.276
12.810
20
1.675
4.002
6.881
9.225
12.627
25
1.679
4.008
6.865
9.180
12.454
30
1.683
4.015
6.853
9.139
12.289
35
1.688
4.024
6.844
9.102
12.133
38
1.691
4.030
6.840
9.081
12.043
40
1.694
4.035
6.838
9.068
11.984
45
1.700
4.047
6.834
9.038
11.841
Temp.
(
°C
)
pH 7
Neutral phosphate
pH 10
Carbonate
0
7.119
10.318
5
7.086
10.245
10
7.058
10.178
15
7.035
10.117
20
7.015
10.061
25
7.000
10.011
30
6.988
9.965
35
6.979
9.925
40
6.973
9.888
45
6.969
9.856
Summary of Contents for LAQUAact D-72G
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