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preface to fifteenth edition

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8.60 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 />

4-Methyl-2,2-(4-methylpyridyl)pyridine<br />

5.32(1)<br />

N-Methylmorpholine<br />

7.13(1)<br />

2-Methyl-1-naphthoic acid 3.11<br />

N-Methyl-1-naphthylamine<br />

3.70(1)<br />

2-Methyl-4-nitrobenzoic acid 1.86<br />

2-Methyl-6-nitrobenzoic acid 1.87<br />

1-Methyl-2-nitroterephthalic acid 3.11<br />

4-Methyl-2-nitroterephthalic acid 1.82<br />

3-Methylpentanedioic acid 4.25 5.41<br />

3-Methylpentane-2,4-dione 10.87<br />

2-Methylpentanoic acid 4.782<br />

3-Methylpentanoic acid 4.766<br />

4-Methylpentanoic acid 4.845<br />

cis-3-Methyl-2-pentenoic acid 5.15<br />

trans-3-Methyl-2-pentenoic acid 5.13<br />

4-Methyl-2-pentenoic acid 4.70<br />

4-Methyl-3-pentenoic acid 4.60<br />

6-Methyl-1,10-phenanthroline 5.11(1)<br />

(2-Methylphenoxy)acetic acid 3.227<br />

(3-Methylphenoxy)acetic acid 3.203<br />

(4-Methylphenoxy)acetic acid 3.215<br />

(2-Methylphenyl)acetic acid (18C) 4.35<br />

(4-Methylphenyl)acetic acid 4.370<br />

5-Methyl-5-phenylbarbituric acid 8.011(0)<br />

3-(2-Methylphenyl)propanoic acid 4.66<br />

3-(3-Methylphenyl)propanoic acid 4.677<br />

3-(4-Methylphenyl)propanoic acid 4.684<br />

1-Methyl-2-phenylpyrrolidine 8.80<br />

5-Methyl-1-phenyl-1,2,3-triazole-4- 3.73<br />

carboxylic acid<br />

Methylphosphinic acid 3.08<br />

Methylphosphonic acid 2.38 7.74<br />

3-Methyl-o-phthalic acid 3.18<br />

4-Methyl-o-phthalic acid 3.89<br />

N-Methylpiperazine ( 0.1) 4.94(2) 9.09(1)<br />

2-Methylpiperazine 5.62(2) 9.60(1)<br />

N-Methylpiperidine<br />

10.19(1)<br />

2-Methylpiperidine<br />

10.95(1)<br />

3-Methylpiperidine<br />

11.07(1)<br />

4-Methylpiperidine ( 0.5) 11.23(1)<br />

2-Methyl-1,2-propanediamine 6.178(2) 9.420(1)<br />

2-Methyl-2-propanethiol 11.2<br />

2-Methylpropanoic acid 4.853<br />

2-Methyl-2-propylamine<br />

10.682(1)<br />

2-Methyl-2-propylglutaric acid 3.626<br />

2-Methylpyridine<br />

5.96(1)<br />

3-Methylpyridine<br />

5.68(1)<br />

4-Methylpyridine<br />

6.00(1)<br />

Methyl 4-pyridinecarboxylate 3.26(1)<br />

6-Methylpyridine-2-carboxylic acid 5.83<br />

2-Methylpyridine-1-oxide<br />

1.029(1)<br />

3-Methylpyridine-1-oxide<br />

10.921(1)

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