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preface to fifteenth edition

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8.24 SECTION 8<br />

TABLE 8.8<br />

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

Ionic strength is zero unless otherwise indicated. Pro<strong>to</strong>nated cations are designated by (1), ( 2), etc., after<br />

the pK a value; neutral species by (0), if not obvious; and negatively charged acids by (1), (2), etc.<br />

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

Abietic acid 7.62<br />

Acetamide<br />

0.37(1)<br />

Acetamidine<br />

1.60(1)<br />

N-(2-Acetamido)-2-aminoethanesulfonic<br />

6.88<br />

acid (20C)<br />

2-Acetamidobenzoic acid 3.63<br />

3-Acetamidobenzoic acid 4.07<br />

4-Acetamidobenzoic acid 4.28<br />

2-(Acetamido)butanoic acid 3.716<br />

N-(2-Acetamido)iminodiacetic acid 6.62<br />

(20C)<br />

3-Acetamidopyridine<br />

4.37(1)<br />

Acetanilide 0.4(1)<br />

40C<br />

13.39(0)<br />

Acetic acid 4.756<br />

Acetic acid-d (in D 2 O) 5.32<br />

Ace<strong>to</strong>acetic acid (18C) 3.58<br />

Ace<strong>to</strong>hydrazine<br />

3.24(1)<br />

Ace<strong>to</strong>ne oxime 12.2<br />

2-Ace<strong>to</strong>xybenzoic acid (acetylsalicyclic<br />

3.48<br />

acid)<br />

3-Ace<strong>to</strong>xybenzoic acid 4.00<br />

4-Ace<strong>to</strong>xybenzoic acid 4.38<br />

Acetylacetic acid (18C) 3.58<br />

N-Acetyl--alanine 3.715<br />

N-Acetyl--alanine 4.455<br />

2-Acetylaminobutanoic acid 3.72<br />

3-Acetylaminopropionic acid 4.445<br />

2-Acetylbenzoic acid 4.13<br />

3-Acetylbenzoic acid 3.83<br />

4-Acetylbenzoic acid 3.70<br />

2-Acetylcyclohexanone 14.1<br />

N-Acetylcysteine (30C) 9.52<br />

Acetylenedicarboxylic acid 1.75 4.40<br />

N-Acetylglycine 3.670<br />

N-Acetylguanidine<br />

8.23(1)<br />

N--Acetyl-L-histidine 7.08<br />

Acetylhydroxamic acid (20C) 9.40<br />

N-Acetyl-2-mercap<strong>to</strong>ethylamine 9.92(SH)<br />

4-Acetyl--mercap<strong>to</strong>isoleucine 10.30<br />

(30C)<br />

2-Acetyl-1-naphthol (30C) 13.40<br />

N-Acetylpenicillamine (30C) 9.90<br />

2-Acetylphenol 9.19<br />

4-Acetylphenol 8.05<br />

2-Acetylpyridine<br />

2.643(1)<br />

3-Acetylpyridine<br />

3.256(1)<br />

4-Acetylpyridine<br />

3.505(1)<br />

Aconitine<br />

8.11(1)<br />

Acridine<br />

5.60(1)<br />

Acrylic acid 4.26<br />

Adenine 4.17(1) 9.75(0)

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