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A chromate–dichromate equilibrium
In association with Nuffield Foundation
Source: © Shutterstock
Try this class practical to investigate an equilibrium between chromate(VI), dichromate(VI) and hydrogen ions. Includes kit list and safety instructions.
In this experiment, students add dilute sulfuric acid to an aqueous solution of potassium chromate(VI). They observe the resulting colour changes, before reversing the reaction using aqueous sodium hydroxide.
The experiment should take no longer than five minutes.
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