Rate of reaction of potassium manganate(VII) and oxalic acid

Rhubarb stalks in a row against a dark grey background

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Investigate the effect of surface area or concentration on rate of reaction using oxalic acid in rhubarb and potassium manganate(VII). Includes kit list and safety instructions.

In this experiment, students use rhubarb sticks, which contain oxalic acid, to reduce and decolourise potassium manganate(VII) solution.

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