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preface to fifteenth edition

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8.66 SECTION 8<br />

TABLE 8.8<br />

pK a Values of Organic Materials in Water at 25C (Continued)<br />

Substance pK 1 pK 2 pK 3 pK 4<br />

N-Propionyglycine 3.718(0)<br />

2-Propoxybenzoic acid (20C) 4.24<br />

3-Propoxybenzoic acid (20C) 4.20<br />

4-Propoxybenzoic acid (20C) 4.78<br />

N-Propylalanine 2.21(1) 10.19(0)<br />

Propylamine<br />

10.568(1)<br />

Propylarsonic acid (18C) 4.21 9.09<br />

Propylenimine<br />

8.18(1)<br />

N-Propylglycine ( 0.1) 2.38(1) 10.03(0)<br />

L-Propylglycine 3.19(1) 8.97(0)<br />

Propylmalonic acid 2.97 5.84<br />

Propylphosphinic acid 3.46<br />

Propylphosphonic acid 2.49 8.18<br />

2-Propylpyridine<br />

6.30(1)<br />

N-Propylveratramine<br />

7.20(1)<br />

2-Propynoic acid 1.887<br />

Pseudoecgonine 9.70<br />

Pseudoisocyanine ( 0.2)<br />

4.59(2)<br />

Pseudotropine<br />

9.86(1)<br />

Pteroylglutamic acid 8.26<br />

Purine 2.52(1) 8.92(0)<br />

Pyrazine<br />

0.6(1)<br />

Pyrazinecarboxamide<br />

0.5(1)<br />

Pyrazole<br />

2.61(1)<br />

Pyridazine<br />

2.33(1)<br />

Pyridine<br />

5.17(1)<br />

Pyridine-d 5<br />

5.83(1)<br />

2-Pyridinealdoxime 3.56(1) 10.17(0)<br />

3-Pyridinealdoxime 4.07(1) 10.39(0)<br />

4-Pyridinealdoxime 4.73(1) 10.03(0)<br />

2-Pyridinecarbaldehyde<br />

3.84(1)<br />

3-Pyridinecarbaldehyde<br />

3.80(1)<br />

4-Pyridinecarbaldehyde<br />

4.74(1)<br />

3-Pyridinecarbamide (nicotinamide)<br />

3.33(1)<br />

3-Pyridinecarbonitrile<br />

1.35(1)<br />

Pyridine-2-carboxylic acid (picolinic<br />

1.01(1) 5.29(0)<br />

acid)<br />

Pyridine-3-carboxylic acid (nicotinic<br />

2.07(1) 4.75(0)<br />

acid)<br />

Pyridine-4-carboxylic acid (isonicotinic<br />

1.84(1) 4.86(0)<br />

acid)<br />

Pyridine-2,3-dicarboxylic acid 2.36(1) 7.08(0)<br />

Pyridine-2,4-dicarboxylic acid 2.23(1) 7.02(0)<br />

Pyridine-2,6-dicarboxylic acid 2.16(1) 6.92(0)<br />

Pyridine-1-oxide<br />

0.688(1)<br />

Pyridoxal 4.20(1) 8.66(ring<br />

OH)<br />

Pyridoxal-5-phosphate ( 0.15) 2.5 4.14 6.20 8.69<br />

Pyridoxamine ( 0.1) 3.37(2) 8.01(1) 10.13(ring<br />

OH)<br />

Pyridoxamine-5-phosphate ( <br />

0.15; pK 5 10.92)<br />

2.5 3.69 5.76 8.61

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