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preface to fifteenth edition

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ELECTROLYTES, EMF, AND CHEMICAL EQUILIBRIUM 8.53<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-Hydroxy-5-nitrobenzoic acid 2.12<br />

2-Hydroxy-6-nitrobenzoic acid 2.24<br />

2-Hydroxy-4-nitrophenylphosphonic<br />

1.22 5.39<br />

acid<br />

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

1.94(0) 5.750(1)<br />

acid<br />

3-Hydroxy-4-nitro<strong>to</strong>luene ( 7.41<br />

0.1)<br />

4-Hydroxypentanoic acid (18C) 4.686<br />

4-Hydroxy-3-pentenoic acid 4.30<br />

3-Hydroxyphenazine (15C) 2.67<br />

4-Hydroxyphenylarsonic acid 3.89 8.37<br />

10.05<br />

(phenol)<br />

3-Hydroxyphenylboric acid 8.55 10.84<br />

2-Hydroxy-2-phenylpropanoic acid 3.532<br />

2-(2-Hydroxyphenyl)pyridine<br />

4.19(1) 10.64<br />

(20C)<br />

trans-4-Hydroxyproline 1.818(1) 9.662(0)<br />

Hydroxypropanedioic acid (tartronic<br />

2.37 4.74<br />

acid)<br />

2-Hydroxypropanoic acid 3.858<br />

1-Hydroxy-2-propylbenzene 10.50<br />

4-Hydroxypteridine 1.3(1) 7.89(0)<br />

2-Hydroxypyridine 1.25(1) 11.62(0)<br />

3-Hydroxypyridine 4.80(1) 8.72(0)<br />

4-Hydroxypyridine 3.23(1) 11.09(0)<br />

2-Hydroxypyridine-N-oxide 0.62(1) 5.97(0)<br />

2-Hydroxypyrimidine 2.24(1) 9.17(0)<br />

4-Hydroxypyrimidine 1.85(1) 8.59(0)<br />

8-Hydroxyquinazoline 3.41(1) 8.65(0)<br />

2-Hydroxyquinoline (20C) 0.31(1) 11.74<br />

3-Hydroxyquinoline (20C) 4.30(1) 8.06(0)<br />

4-Hydroxyquinoline (20C) 2.27(1) 11.25(0)<br />

5-Hydroxyquinoline (20C) 5.20(1) 8.54(0)<br />

6-Hydroxyquinoline (20C) 5.17(1) 8.88(0)<br />

7-Hydroxyquinoline (20C) 5.48(1) 8.85(0)<br />

8-Hydroxyquinoline (20C) 4.91(1) 9.81(0)<br />

8-Hydroxyquinoline-5-sulfonic 4.092(1) 8.776(0)<br />

acid<br />

DL-Hydroxysuccinic acid (malic 3.458 5.097<br />

acid)<br />

L-Hydroxysuccinic acid 3.40 5.05<br />

Hydroxytetracycline 3.27(1) 7.32(0) 9.11(1)<br />

5-Hydroxy-1,2,3,4-tetrazole 3.32<br />

4-Hydroxy-3-(2-thiazolyazo)<strong>to</strong>luene<br />

8.36<br />

2-Hydroxy<strong>to</strong>luene 10.33<br />

3-Hydroxy<strong>to</strong>luene 10.10<br />

4-Hydroxy<strong>to</strong>luene 10.276<br />

4-Hydroxy-,,-trifluoro<strong>to</strong>luene 8.675<br />

1-Hydroxy-2,4,6-trihydroxymethylbenzene<br />

9.56<br />

Hydroxyuracil 8.64

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