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preface to fifteenth edition

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TABLE 8.9<br />

Selected Equilibrium Constants in Aqueous Solution at Various Temperatures<br />

(1), pro<strong>to</strong>nated cation<br />

(0), neutral molecule<br />

(1), singly ionized anion<br />

Abbreviations Used in the Table<br />

(2), doubly ionized anion<br />

pK au<strong>to</strong> , negative logarithm (base 10) of au<strong>to</strong>pro<strong>to</strong>lysis constant<br />

pK sp , negative logarithm (base 10) of solubility product<br />

Temperature, C<br />

Substance 0 5 10 15 20 25 30 35 40 50<br />

Acetic acid (0) 4.780 4.770 4.762 4.758 4.757 4.756 4.757 4.762 4.769 4.787<br />

DL-N-Acetylalanine (1) 3.699 3.699 3.703 3.708 3.715 3.725 3.733 3.745 3.774<br />

-Acetylaminopropionic (1) 4.479 4.465 4.465 4.449 4.445 4.444 4.443 4.445 4.457<br />

N-Acetylglycine (1) 3.682 3.676 3.673 3.667 3.670 3.673 3.678 3.685 3.706<br />

-Alanine<br />

(1) 2.42 2.39 2.35 2.34 2.33 2.33 2.33 2.33<br />

(0) 10.59 10.29 10.01 9.87 9.74 9.62 9.49 9.26<br />

2-Aminobenzenesulfonic acid (0),<br />

pK 2 2.633 2.591 2.556 2.521 2.448 2.459 2.431 2.404 2.380 2.338<br />

3-Aminobenzenesulfonic acid (0),<br />

pK 2 4.075 4.002 3.932 3.865 3.799 3.738 3.679 3.622 3.567 3.464<br />

4-Aminobenzenesulfonic acid (0),<br />

pK 2 3.521 3.457 3.398 3.338 3.283 3.227 3.176 3.126 3.079 2.989<br />

3-Aminobenzoic acid (0) 4.90 4.79 4.75 4.68 4.60<br />

4-Aminobenzoic acid (0) 4.95 4.85 4.90 4.95 5.10<br />

2-Aminobutyric acid<br />

(1) 2.334 2.286 2.289 37.5C 2.297<br />

(0) 10.530 9.380 9.518 37.5C 9.234<br />

4-Aminobutyric acid<br />

(1) 4.057 4.046 4.038 4.031 4.027 4.025 4.027 4.032<br />

(0) 11.026 10.867 10.706 10.556 10.409 10.269 10.114 9.874<br />

2-Aminoethylsulfonic acid (0) 9.452 9.316 9.186 9.061 8.940 8.824 8.712 9.499<br />

8.73

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