2011•Journal of Chemical EducationRequires access

Solubility and Solubility Product Determination of a Sparingly Soluble Salt: A First-Level Laboratory Experiment

Raffaele P. Bonomo, Giovanni Tabbı̀, Laura I. Vagliasindi

Abstract

A simple experiment was devised to let students determine the solubility and solubility product, K sp, of calcium sulfate dihydrate in a first-level laboratory. The students experimentally work on an intriguing equilibrium law: the constancy of the product of the ion concentrations of a sparingly soluble salt. The determination of solubility is proposed either in an equimolar precipitation of CaSO 4 ·2H 2 O, from which the K sp is obtained, or working with an excess of one of the two reagents.

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Key concepts: Solubility, Solubility equilibrium, Chemistry, Salt (chemistry), Reagent, Molar solubility, Precipitation, Chromatography