Abstract
Departures from Raoult’s law are often found in liquid mixtures resulting in volume nonadditivity. Modifications are proposed for experiments demonstrating volume contraction of water/ethanol and volume expansion of ethyl acetate/carbon disulfide liquid mixtures. A layer of paraffin oil or water is used to prevent mixing of the liquids at an earlier stage then desired. A demonstration of volume expansion in a CS2/ethyl acetate system is proposed as well. The modifications significantly improve the ease of the demonstrations, which can be made even more impressive by coloring the liquids. A reaction vessel of simple construction is offered for a more vivid demonstration of the phenomenon.
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Petruševski, V.M., Najdoski, M.Z. Volume Nonadditivity of Liquid Mixtures: Modifications to Classical Demonstrations. Chem. Educator 6, 161–163 (2001). https://doi.org/10.1007/s00897010478a
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DOI: https://doi.org/10.1007/s00897010478a