@chemclassrules: the #methyleneblue bottle demonstration, in which a solution of sodium hydroxide and dextrose are able to reduce normally blue methylene blue to a colorless form of the molecule. shaking the solution introduces oxygen, which oxidizes the methylene blue back to its normal, brilliantly blue self. as the solution sits, the dextrose and sodium hydroxide get back to work reversing the reaction. the solution can cycle back and forth from 10 to like 40 or so times (depending on the initial amounts used) before the dextrose is used up. interestingly, the solution turns somewhat amber during the "colorless" phase as the solution gets "tired" from cycling, and if allowed to sit overnight it will lock into a deep crimson color. #Science #chemistry #lab #scienceexperiments

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Wednesday 08 April 2026 02:02:22 GMT