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preface to fifteenth edition

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ELECTROLYTES, EMF, AND CHEMICAL EQUILIBRIUM 8.67<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 />

Pyridoxine (vitamin B 6 ) (18C) 5.00(1) 8.96(ring<br />

OH)<br />

3-(2-Pyridyl)alanine 1.37(2) 4.02(1) 9.22(0)<br />

3-(3-Pyridyl)alanine 1.77(2) 4.64(1) 9.10(0)<br />

2-(2-Pyridyl)benzimidazole ( 5.58(1)<br />

0.16)<br />

2-(2-Pyridyl)imidazole ( <br />

8.98(1)<br />

0.005)<br />

4-(2-Pyridyl)imidazole ( 0.1) 5.49(1)<br />

Pyrimidine<br />

1.30(1)<br />

2,4(1H,3H)-Pyrimidinedione (uracil)<br />

0.6(1) 9.46(0)<br />

2,4,5,6(1H,3H)-Pyrimidinetetrone- 4.57(0)<br />

5-oxime<br />

Pyrocatecholsulfonephthaleine 7.82 9.76 11.73<br />

Pyroxilidine<br />

11.11(1)<br />

Pyrrole-1-carboxylic acid 4.45<br />

Pyrrole-2-carboxylic acid 4.45<br />

Pyrrole-3-carboxylic acid 4.453<br />

Pyrrolidine<br />

11.305(1)<br />

Pyrrolidine-2-carboxylic acid (pro-<br />

1.952(1) 10.640(0)<br />

line)<br />

2-[2-(N-Pyrrolidinyl)ethyl]pyridine 3.60(2) 9.39(1)<br />

3-[2-(N-Pyrrolidinyl)ethyl]pyridine 4.28(2) 9.28(1)<br />

4-[2-(N-Pyrrolidinyl)ethyl]pyridine 4.65(2) 9.27(1)<br />

2-(1-Pyrrolidinylmethyl)pyridine 2.54(1) 8.56(1)<br />

3-(1-Pyrrolidinylmethyl)pyridine 3.14(2) 8.36(1)<br />

4-(1-Pyrrolidinylmethyl)pyridine 3.38(2) 8.16(1)<br />

3-Pyrroline<br />

0.27(1)<br />

Quinidine 4.0(1) 8.54(0)<br />

Quinine 4.11(1) 8.52(0)<br />

Quinoline<br />

4.80(1)<br />

Quinoxaline<br />

0.72(1)<br />

D-Raffinose 12.74<br />

Riboflavin (vitamin B 2 )( 0.01) ca 0.2 9.69<br />

-D-Ribofuranose 12.11<br />

D-Ribose-5-phosphonic acid — 6.70(1) 13.05(2)<br />

D-Saccharic acid 5.00(0)<br />

Saccharin (o-benzoic sulfimide) 2.32<br />

Sarcosine 2.12(1) 10.20(0)<br />

Sarcosine amide<br />

8.35(1)<br />

Sarcosine dimethylamide<br />

8.86(1)<br />

Sarcosine methylamide<br />

8.28(1)<br />

Sarcosylglycine ( 0.16) 3.15(1) 8.56(0)<br />

Sarcosylleucine 3.15(1) 8.67(0)<br />

Sarcosylsarcosine 2.92(1) 9.15(0)<br />

Sarcosylserine 3.17(1) 8.63(0)<br />

3-Selenosemicarbazide ( 0.1) 0.8(1)<br />

Semicarbazide ( 0.1)<br />

3.53(1)<br />

L-Serine 2.21(1) 9.15(0) 13.6

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