I enjoyed reading Klingshirn et al.’s article (1) on “greening up” the classical stoichiometry experiment where students determine the formula of a hydrate. However there is an additional important point to be made on safety in the suggested variation. In adopting the change to copper(II) chloride dihydrate, it is critical that teachers and instructors use the 110 °C oven as noted in the article, rather than a Bunsen burner. Copper(II) chloride dihydrate decomposes at temperatures above 300 °C, releasing chlorine gas (2, 3).
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