Technical note
98
■
Technical note
●
pH standard solutions at various temperatures
< USA >
< NIST (pH 2, 4, 12 are common) >
Tip
The differences between USA and NIST standard solutions are a different pH 7 value, and
the use of pH 9 standard solution instead of pH 10 standard solution in NIST.
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 10
Carbonate
pH 12
Saturated calcium
hydroxide solution
0
1.666
4.003
7.119
10.318
13.423
5
1.668
3.999
7.086
10.245
13.207
10
1.670
3.998
7.058
10.178
13.003
15
1.672
3.999
7.035
10.117
12.810
20
1.675
4.002
7.015
10.061
12.627
25
1.679
4.008
7.000
10.011
12.454
30
1.683
4.015
6.988
9.965
12.289
35
1.688
4.024
6.979
9.925
12.133
40
1.694
4.035
6.973
9.888
11.984
45
1.700
4.047
6.969
9.856
11.841
Temp.
(
°C
)
pH 7
Neutral phosphate
pH 9
Borate
0
6.984
9.464
5
6.951
9.395
10
6.923
9.332
15
6.900
9.276
20
6.881
9.225
25
6.865
9.180
30
6.853
9.139
35
6.844
9.102
40
6.838
9.068
45
6.834
9.038
Summary of Contents for LAQUA-PC1100
Page 1: ...Benchtop pH ORP Conductivity Meter LAQUA PC1100 Instruction Manual CODE GZ0000427795 ...
Page 2: ......
Page 16: ......
Page 28: ...M E M O 12 ...
Page 94: ...M E M O 78 ...
Page 100: ...M E M O 84 ...
Page 108: ...M E M O 92 ...
Page 117: ...2 Miyanohigashi Kisshoin Minami ku Kyoto 601 8510 Japan http www horiba com ...
