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preface to fifteenth edition

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8.52 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 />

2-Hydroxyethyltrimethylamine 8.94(1)<br />

L--Hydroxyglutamic acid 2.09 4.18 9.20<br />

1-Hydroxy-4-hydroxymethylbenzene<br />

9.84<br />

5-Hydroxy-2-(hydroxymethyl)-4Hpyran-4-one<br />

7.90 8.03<br />

3-Hydroxy-2-hydroxymethylpyridine<br />

5.00(1) 9.07(OH)<br />

(20C, 0.2)<br />

3-Hydroxy-4-hydroxymethylpyridine<br />

5.00(1) 8.95(OH)<br />

(20C, 0.2)<br />

8-Hydroxy-7-iodoquinoline-5-sulfonic<br />

2.51(0) 7.417(1)<br />

acid<br />

Hydroxylysine (38C, 0.1) 2.13(2) 8.62(1) 9.67(0)<br />

2-Hydroxy-3-methoxybenzaldehyde<br />

7.912<br />

3-Hydroxy-4-methoxybenzaldehyde<br />

8.889<br />

(isovanillin)<br />

4-Hydroxy-3-methoxybenzaldehyde<br />

7.396<br />

(vanillin)<br />

4-Hydroxy-3-methoxybenzoic acid 4.355<br />

1-Hydroxy-2-methoxybenzylamine 8.70(1) 10.52(0)<br />

2-Hydroxy-1-methoxybenzylamine 8.89(1) 10.52(0)<br />

3-Hydroxy-2-methoxybenzylamine 8.94(1) 10.42(0)<br />

2-Hydroxymethyl-2-benzeneacetic 4.12<br />

acid<br />

(2-Hydroxy-5-methylbenzene)- 10.15<br />

methanol<br />

2-Hydroxy-3-methylbenzoic acid 2.99<br />

2-Hydroxy-4-methylbenzoic acid 3.17<br />

2-Hydroxy-5-methylbenzoic acid 4.08<br />

2-Hydroxy-6-methylbenzoic acid 3.32<br />

2-Hydroxy-2-methylbutanoic acid 3.991<br />

(18C)<br />

3-Hydroxy-2-methylbutanoic acid 4.648<br />

(18C)<br />

4-Hydroxy-4-methylpentanoic acid 4.873<br />

(18C)<br />

1-Hydroxymethylphenol 9.95<br />

Hydroxymethylphosphoric acid 1.91 7.15<br />

2-Hydroxy-2-methylpropanoic acid 3.717<br />

( 0.1)<br />

2-Hydroxy-4-methylpyridine<br />

4.529(1)<br />

8-Hydroxy-2-methylquinoline 5.55(1) 10.31(0)<br />

8-Hydroxy-4-methylquinoline 5.56(1) 10.00(0)<br />

8-Hydroxy-2-methylquinoline-5- 4.80(0) 9.30(1)<br />

sulfonic acid<br />

8-Hydroxy-4-methylquinoline-7- 4.78(0) 10.01(1)<br />

sulfonic acid<br />

8-Hydroxy-6-methylquinoline-5- 4.20(0) 8.7(1)<br />

sulfonic acid<br />

2-Hydroxy-1-naphthoic acid (20C) 3.29 9.68<br />

2-Hydroxy-2-nitrobenzoic acid 2.23<br />

2-Hydroxy-3-nitrobenzoic acid 1.87

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