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A simple, fast, and microscale qualitative demonstration illustrating the acidic and basic nature of amphiprotic anions suitable for senior high school or undergraduate general chemistry classes is presented. The demonstration involves frequently used pH indicators and salt solutions in general chemistry laboratory classes. This will provide an excellent avenue to engage students in hydrolysis and equilibrium concepts involving polyprotic anions in a more visually appealing approach. This demonstration can be completed in less than 10 min provided all reagents have been prepared prior to experiment.
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Punzalan et al. (2017) studied this question.
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