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MI 611-211 – October 2005 3. Operation

NOTE

Values in Table 8 are based on NIST Primary Buffer Systems. pH values are at

25°C. Chemical formulas are as follows:

4.01 pH: 0.05 molar Potassium Hydrogen Phthalate

6.86 pH: 0.025 molar Potassium Dihydrogen Phosphate;

0.025 molar Disodium Hydrogen Phosphate

9.18 pH: 0.01 molar Sodium Tetraborate Decahydrate (Borax)

15 4.00 6.90 9.28

20 4.00 6.88 9.23

25 4.01 6.86 9.18

30 4.02 6.85 9.14

35 4.03 6.84 9.10

40 4.04 6.84 9.07

45 4.05 6.83 9.04

50 4.06 6.83 9.01

Table 8. NIST Buffer Tables (Continued)

Temperature

4.01 pH 6.86 pH 9.18 pH

pH Value pH Value pH Value

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 61 62

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