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Sunlight Driven Chameleon Reaction of Aqueous Potassium Octacyanotungstate #timelapse #chemistry

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First published at 11:48 UTC on January 22nd, 2023.

poormanschemist

PoorMansChemist

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Demonstration of the color changes an aqueous solution of K4[W(CN)8] undergoes when it's placed in direct sunlight. In reality this sequence of color changes took almost exactly an hour (the final change from maroonish-purple to bright purple is slow). This would make an excellent classroom demonstration of photo-chemistry and photo-decomposition of a chemical compound.

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