A simple, inexpensive, and environmentally friendly undergraduate laboratory experiment is described in which students use visible spectroscopy to determine a numerical value for an equilibrium constant, K c . The experiment correlates well with the lecture topic of equilibrium even though the subject of the study is an acid−base indicator, bromothymol blue. The experiment gives excellent results and offers an inexpensive, zero-waste alternative to traditional equilibrium experiments, such as the Fe(SCN) 2+ equilibrium.
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Klotz et al. (2011) studied this question.
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