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preface to fifteenth edition

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8.42 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 />

1,2-Dihydroxy-4-nitrobenzene 6.701<br />

( 0.1)<br />

2,4-Dihydroxy-1-phenylazobenzene 11.98<br />

( 0.1)<br />

2,4-Dihydroxyoxazolidine<br />

6.11(1)<br />

2,4-Dihydroxypteridine 1.3 7.92<br />

2,6-Dihydroxypurine 7.53(0) 11.84(1)<br />

2,4-Dihydroxypyridine (20C) 1.37(1) 6.45(0) 13(1)<br />

Dihydroxytartaric acid 1.95 4.00<br />

1,4-Dihydroxy-2,3,5,6-tetramethylbenzene<br />

11.25 12.70<br />

( 0.65)<br />

3,5-Diiodoaniline<br />

2.37(1)<br />

2,5-Diiodohistamine 2.31(2) 8.20(1) 10.11(0)<br />

2,5-Diiodohistidine ( 0.1) 2.72 8.18 9.76<br />

3,5-Diiodophenol 8.103<br />

3,5-Diiodotyrosine 2.117(1) 6.479(0) 7.821(1)<br />

Diisopropylmalonic acid 2.124 8.848<br />

Dilactic acid 2.955<br />

threo-1,4-Dimercap<strong>to</strong>-2,3-butanediol<br />

8.9<br />

meso-2,3-Dimercap<strong>to</strong>succinic acid 2.71 3.48 8.89(SH) 10.79(SH)<br />

3,5-Dimethoxyaniline<br />

3.86(1)<br />

2,6-Dimethoxybenzoic acid 3.44<br />

1,10-Dimethoxy-3,8-dimethyl-4,7- 7.21<br />

phenanthroline<br />

Di(2-methoxyethyl)amine<br />

9.51(1)<br />

3,5-Dimethoxyphenol 9.345<br />

(3,4-Dimethoxy)phenylacetic acid 4.333<br />

Dimethylamine<br />

10.77(1)<br />

4-Dimethylaminobenzaldehyde 1.647(1)<br />

N,N-Dimethylaminocyclohexane 10.72(1)<br />

4-Dimethylamino-2,3-dimethyl-1- 4.18(1)<br />

phenyl-3-pyrazolin-5-one<br />

4-Dimethylamino-3,5-dimethylpyridine<br />

8.15(1)<br />

(20C)<br />

2-(Dimethylamino)ethanol<br />

9.26(1)<br />

2-[2-(Dimethylamino)ethyl]pyridine<br />

3.46(2) 8.75(1)<br />

3-(Dimethylaminoethyl)pyridine 4.30(2) 8.86(1)<br />

4-(Dimethylaminoethyl)pyridine 4.66(2) 8.70(1)<br />

4-(Dimethylamino)-3-ethylpyridine 8.66(1)<br />

(20C)<br />

4-(Dimethylamino)-3-isopropylpyridine<br />

8.27(1)<br />

(20C)<br />

2-(Dimethylaminomethyl)pyridine 2.58(2) 8.12(1)<br />

3-(Dimethylaminomethyl)pyridine 3.17(2) 8.00(1)<br />

4-(Dimethylaminomethyl)pyridine 3.39(2) 7.66(1)<br />

4-(Dimethylamino)-3-methylpyridine<br />

8.68(1)<br />

(20C)<br />

4-(Dimethylaminophenyl)phosphonic<br />

2.0(1) 4.2 7.35<br />

acid<br />

3-(Dimethylamino)propanoic acid 9.85(1)<br />

4-(Dimethylamino)pyridine (20C) 6.09(1)

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