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preface to fifteenth edition

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ELECTROLYTES, EMF, AND CHEMICAL EQUILIBRIUM 8.41<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 />

meso-2,3-Diethylsuccinic acid 3.54 6.59<br />

N,N-Diethyl-o-<strong>to</strong>luidine<br />

7.18(1)<br />

Difluoroacetic acid 1.33<br />

3,3-Difluoroacrylic acid 3.17<br />

Diglycolic acid 2.96<br />

Diguanidine 12.8<br />

Dihexylamine<br />

11.0(1)<br />

Dihydroarecaidine 9.70<br />

Dihydroarecaidine, methyl ester 8.39<br />

Dihydrocodeine<br />

8.75(1)<br />

Dihydroergonovine<br />

7.38(1)<br />

-Dihydrolysergic acid 3.57 8.45<br />

-Dihydrolysergic acid 3.60 8.71<br />

-Dihydrolysergol 8.30<br />

-Dihydrolysergol 8.23<br />

Dihydromorphine 9.35<br />

3,4-Dihydroxyalanine 2.32(1) 8.68(0) 9.87(1)<br />

1,2-Dihydroxyanthraquinone-3-sulfonic<br />

— 5.54(1) 11.01(2)<br />

acid (alizarin-3-sulfonic<br />

acid)<br />

3,4-Dihydroxybenzaldehyde 7.55<br />

1,2-Dihydroxybenzene (pyrocatechol)<br />

9.356(0) 12.98(1)<br />

( 0.1)<br />

1,3-Dihydroxybenzene (resorcinol) 9.44(0) 12.32(1)<br />

1,4-Dihydroxybenzene (hydroquinone)<br />

9.91(0) 12.04(1)<br />

4,5-Dihydroxybenzene-1,3-disulfonic<br />

— — 7.66(2) 12.6(3)<br />

acid<br />

2,3-Dihydroxybenzoic acid (30C) 2.98 10.14<br />

2,4-Dihydroxybenzoic acid (-resorcyclic<br />

3.29 8.98<br />

acid)<br />

2,5-Dihydroxybenzoic acid 2.97 10.50<br />

2,6-Dihydroxybenzoic acid 1.30<br />

3,4-Dihydroxybenzoic acid 4.48 8.67 11.74<br />

3,5-Dihydroxybenzoic acid 4.04<br />

2,5-Dihydroxy-p-benzoquinone 2.71 5.18<br />

3,4-Dihydroxy-3-cyclobutene-1,2- 0.541 3.480<br />

dione<br />

2,3-Dihydroxy-2-cyclopenten-1- 4.72<br />

one (20C)<br />

1,4-Dihydroxy-2,6-dinitrobenzene 4.42 9.14<br />

Di(2,2-hydroxyethyl)amine<br />

8.8(1)<br />

N,N-Di(2-hydroxyethyl)glycine 8.333<br />

Dihydroxymaleic acid 1.10<br />

Dihydroxymalic acid 1.92<br />

1,3-Dihydroxy-2-methylbenzene 10.05 11.64<br />

( 0.65)<br />

2,2-Di(hydroxymethyl)-3-hydroxypropanoic<br />

4.460<br />

acid<br />

2,4-Dihydroxy-5-methylpyrimidine 9.90<br />

2,4-Dihydroxy-6-methylpyrimidine 9.52<br />

1,4-Dihydroxynaphthalene (26C, 9.37 10.93<br />

0.65)<br />

1,2-Dihydroxy-3-nitrobenzene 6.68

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