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Fehling's solution test for aldehydes; using glucose for positive result and starch for control
Автор: Sergei's Chemistry
Загружено: 2023-09-27
Просмотров: 3842
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Fehling's solution test for aldehydes: if aldehyde is added to the solution, on heating it is turning from blue (due to copper (II) ions) to brown or red - precipitate of Cu2O (copper (I) oxide) is formed.
Essentially we are testing for extremely good reducing properties of aldehydes, which can reduce even such weak oxidising agent as Cu2+ in alkaline medium.
As the result of the reaction aldehyde is oxidised forming carboxilate ion.
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