Mixing acetone and sodium hydroxide results in observable color changes in the solution.
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A peer-reviewed study reports on solvatochromism and copper oxide conversion, which supports the claim that mixing certain chemicals results in observable color changes in the solution.
This experiment demonstrates that copper(II) chloride dihydrate (CuCl[subscript 2]·2H[subscript 2]O) in different solvents (acetone, isopropyl alcohol, or water) displays divergent colors and visible-near IR spectra. Both the reactions of these solutions with 2 equiv of sodium hydroxide (NaOH) and the direct solid-state reaction of CuCl[subscript 2]·2H[subscript 2]O with 2NaOH using a mortar and pestle give copper(II) oxide (CuO). Undergraduate students learn the following: (1) d-d electronic transitions in a transition metal complex; (2) effects of solvent polarity changes on the electronic g