Blue Bottle Reaction Classroom Demonstration

 

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Discover the principle of oxidation-reduction with a mysterious color change. When a flask containing a colorless solution is shaken, a blue color appears. After a few seconds, the blue color fades and the solution becomes colorless again. Shake again to get the blue color back. The can be repeated many times.
Methylene blue acts as a catlyst for the oxidation of dextrose by gaseous oxygen. Methylene blue indicator is blue in the oxidized form and colorless in the reduced form. Shaking the flask dissolves oxygen in the solution and oxidizes the dye back to the blue form. If the solution is allowed to stand, the methylene is reduced by dextrose back to the colorless form.

Contains: (enough for 5 demos)
1 x 250 ml Potassium Hydroxide, 1.0M Solution
1 x 6 ml Methylene Blue Chloride, 1% Solution
5 bags x 5g Dextrose (Glucose) Powder

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