The Process Of The Blue Mettle Experiment: The Blue-Bottle Experiment

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The “blue-bottle” experiment demonstrates a redox reaction. This is one of the most common reactions in chemistry. Redox reactions are the movement of electrons from one substance to another. The word “redox” comes from the concepts of reduction and oxidation. Reduction is the intake of an electron by an atom. Oxidation is the opposite. It is the loss of an electron by an atom. These two reactions go hand in hand because in a chemical reaction, one reaction cannot happen without the other.
The blue bottle experiment is a chemical reaction in which a bottle with a water solution containing glucose, NaOH, methylene blue and air turns from a colorless substance to a dark blue substance after shaking. In this reaction, glucose is oxidized by dioxygen and forms C6H12O7 (gluconic acid):CH2OH–CHOH–CHOH–CHOH–CHOH–CHO + 1/2 O2 --> CH2OH–CHOH–CHOH–CHOH–CHOH–COOH. The solution loses color again after a short period of time. This color change can be repeated as many times as the bottle is shaken. First step is when the alkenols of glucose is formed. During the second step the redox reaction o...

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