Abstract

An expansion of the classic NMR study of the acetylacetone enol to keto equilibrium, now widely employed in a basic form as a physical chemistry laboratory course experiment, is described. Repeating the basic experiment in a series of aprotic solvents of increasing polarity focuses the laboratory exercise on the origin of solvent-induced shifts in the equilibrium position. The results may be rigorously interpreted in the context of the Onsager–Kirkwood theory. However, a simpler theoretical explanation, more readily appreciated by undergraduate students, can be based on the interaction energy between the solute and solvent dipole moments.

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