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preface to fifteenth edition

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8.6 SECTION 8<br />

8.2 EQUILIBRIUM CONSTANTS<br />

TABLE 8.5<br />

Ionic Product Constant of Water<br />

This table gives values of pKw on a molal scale, where Kw is the ionic activity product constant of water. Values<br />

are from W. L. Marshall and E. U. Franck, J. Phys. Chem. Ref. Data, 10:295 (1981).<br />

Temp.,<br />

C<br />

pKw<br />

Temp.,<br />

C<br />

pKw<br />

Temp.,<br />

C<br />

pKw<br />

0 14.938 45 13.405 95 12.345<br />

5 14.727 50 13.275 100 12.264<br />

10 14.528 55 13.152 125 11.911<br />

15 14.340 60 13.034 150 11.637<br />

18 14.233 65 12.921 175 11.431<br />

20 14.163 70 12.814 200 11.288<br />

25 13.995 75 12.711 225 11.207<br />

30 13.836 80 12.613 250 11.192<br />

35 13.685 85 12.520 275 11.251<br />

40 13.542 90 12.431 300 11.406<br />

TABLE 8.6<br />

Solubility Product Constants<br />

The data refer <strong>to</strong> various temperatures between 18 and 25C, and were compiled from values cited by Bjerrum,<br />

Schwarzenbach, and Sillen, Stability Constants of Metal Complexes, part II, Chemical Society, London, 1958,<br />

and values taken from publications of the IUPAC Solubility Data Project: Solubility Data Series, International<br />

Union of Pure and Applied Chemistry, Pergamon Press, Oxford, 1979–1992; H. L. Clever, and F. J. Johns<strong>to</strong>n,<br />

J. Phys. Chem. Ref. Data, 9:751 (1980); Y. Marcus, Ibid. 9:1307 (1980); H. L. Clever, S. A. Johnson, and<br />

M. E. Derrick, Ibid. 14:631 (1985), and 21:941 (1992).<br />

In the table, “L” is the abbreviation of the organic ligand.<br />

Compound Formula pK sp K sp<br />

Actinium<br />

hydroxide Ac(OH) 3 15 1 10 15<br />

Aluminum<br />

arsonate AlAsO 4 15.80 1.6 10 16<br />

cupferrate AlL 3 18.64 2.3 10 19<br />

hydroxide Al(OH) 3 32.89 1.3 10 33<br />

phosphate AlPO 4 20.01 9.84 10 21<br />

8-quinolinolate AlL 3 29.00 1.00 10 29<br />

selenide Al 2 Se 3 24.4 4 10 25<br />

sulfide Al 2 S 3 6.7 2 10 7<br />

Americium<br />

(III) hydroxide Am(OH) 3 19.57 2.7 10 20<br />

(IV) hydroxide Am(OH) 4 56 1 10 56<br />

Ammonium<br />

uranyl arsenate NH 4 UO 2 AsO 4 23.77 1.7 10 24<br />

Arsenic<br />

(III) sulfide As 2 S 3 21.68 2.1 10 22

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