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(i) Add 10 mL of 0.1M solution of potassium permanganate and 10 mL 3M solution of dilute
sulphuric acid to 200 mL of water containing sulphur dioxide. The solution will gradually
become colourless as the sulphur dioxide reacts with the permanganate. The experiment can
be continued further by stirring in a 0.25M solution of barium chloride when the solution
will become "milky" due to the formation of barium sulphate.
(ii) Ensure there is a continuous supply of sulphur dioxide for bleaching Bowers and other plants. The gas from the supply is passed through a jar containing the plant, and excess gas is absorbed in water. The colour of the bleached plant can easily be regenerated by placing the plant in a solution of hydrogen peroxide. This experiment could be used as an introduction to the processes of reduction and oxidation.
sharon kalunda answered the question on April 12, 2019 at 08:43
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