The Pelter Effect

OH, no such simplebehavior is to be expected, nor is it found Rules for such systems have still to be discovered. The reason for the above dependence of solubility upon compound formation becomes evident when we examine the freezing-point depression curve of a system such as L4S04-H2SO4. The absolute freezing-point of the salt is so high that, unless compound formation took place, solubility in the acid at ordinary temperatures would, according to the Schroder-Le Chatelier equation,4 necessarily be negligible. The removal of simple solute molecules by combination with solvent, however, results in an increased solubility, and the extent of such increase depends, naturally, upon the extent of compound formation. The further development of this topic and the presentation of quantitative results will be given in forthcoming articles in the Journal of the American Chemical Society. * Contribution No. 350. 1 Kendall and Booge, J. Amer. Chem. Soc., 39, 1917 (2323). 2 Carpenter, Ph.D. Dissertation, Chicago, 1915; Gibbons, J. Amer. Chem. Soc., 37, 1915 (149); Booge, Ph.D. Dissertation, Columbia, 1916; Gross, Ph.D. Dissertation, Columbia, 1919; Landon, Ph.D. Dissertation, Columbia, 1920; Adler, Ph.D. Dissertation, Columbia, 1920; Davidson, Ph.D. Dissertation, Columbia, 1920. 3 Kendall and Booge, loc. cit.; Gross, loc. cit. 4 Roozeboom, Heterogene Gleichgewichte, 2, 1904 (270-84).