Phosphate

Useful Range
pKa1 pH 1.70 - 2.90
pKa2 pH 5.80 - 8.00
Note

Inhibits some enzymes, precipitates with divalent cations, pKa affected by dilution
Wikipedia Entry
Phosphoric acid
pKa vs. Temperature
4°C 20°C 25°C 37°C
pKa1 2.15
pKa2 7.26 7.21 7.20 7.16
pKa3 12.33
d(pKa1)/dT
0.0044
d(pKa2)/dT
-0.0028
d(pKa3)/dT
-0.0260
Ingredients with this Buffer
1 Potassium Phosphate Buffer pH 5.8, 1 M
2 Potassium Phosphate Buffer pH 6.0, 1 M
3 Potassium Phosphate Buffer pH 6.2, 1 M
4 Potassium Phosphate Buffer pH 6.4, 1 M
5 Potassium Phosphate Buffer pH 6.6, 1 M
6 Potassium Phosphate Buffer pH 6.8, 1 M
7 Potassium Phosphate Buffer pH 7.0, 1 M
8 Potassium Phosphate Buffer pH 7.15, 1 M
9 Potassium Phosphate Buffer pH 7.2, 1 M
10 Potassium Phosphate Buffer pH 7.4, 1 M
11 Potassium Phosphate Buffer pH 7.6, 1 M
12 Potassium Phosphate Buffer pH 7.8, 1 M
13 Potassium Phosphate Buffer pH 8.0, 1 M
14 Potassium Phosphate Dibasic (solid)
15 Potassium Phosphate Dibasic, 1 M
16 Potassium Phosphate Dibasic, 88 mM (100X)
17 Potassium Phosphate Monobasic (solid)
18 Potassium Phosphate Monobasic, 1 M
19 Potassium Phosphate Tribasic, 1 M
20 Sodium Phosphate Buffer pH 6.0, 1 M
21 Sodium Phosphate Buffer pH 6.1, 1 M
22 Sodium Phosphate Buffer pH 6.2, 1 M
23 Sodium Phosphate Buffer pH 6.3, 1 M
24 Sodium Phosphate Buffer pH 6.4, 1 M
25 Sodium Phosphate Buffer pH 6.5, 1 M
26 Sodium Phosphate Buffer pH 6.6, 1 M
27 Sodium Phosphate Buffer pH 6.7, 1 M
28 Sodium Phosphate Buffer pH 6.8, 1 M
29 Sodium Phosphate Buffer pH 6.9, 1 M
30 Sodium Phosphate Buffer pH 7.0, 1 M
31 Sodium Phosphate Buffer pH 7.1, 1 M
32 Sodium Phosphate Buffer pH 7.2, 1 M
33 Sodium Phosphate Buffer pH 7.3, 1 M
34 Sodium Phosphate Buffer pH 7.4, 1 M
35 Sodium Phosphate Dibasic Anhydrous (solid)
36 Sodium Phosphate Dibasic Dihydrate (solid)
37 Sodium Phosphate Dibasic Dodecahydrate (solid)
38 Sodium Phosphate Dibasic Heptahydrate (solid)
39 Sodium Phosphate Dibasic, 1 M
40 Sodium Phosphate Dibasic, 100 mM
41 Sodium Phosphate Monobasic Anhydrous (solid)
42 Sodium Phosphate Monobasic Monohydrate (solid)
43 Sodium Phosphate Monobasic, 1 M
44 Sodium Phosphate Monobasic, 100 mM
45 Sodium Phosphate Tribasic, 1 M
46 Triethylammonium Phosphate pH 3.0, 1 M
47 Trimethylammonium Phosphate, 1 M