Solution graphique de problèmes de cristallisation simples

Abstract

The solubility of a salt is often indicated in grams of anhydrous salt per 100 g of water. The solubility polytherm expressed in these units allows to read directly on the diagram the amount of salt which can be cristallized out by variation of the temperature, provided that the salt cristallizes in the anhydrous form. Otherwise, or if the solubility is given in grams of anhydrous salt per 100 g of solution, the problem had to be solved hitherto by a numerical calculus. By the graphical methods outlined in this article, the results can be obtained simply and rapidly with sufficient accuracy.