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Fehling's solution
Fehling's solution is a chemical reagent used to differentiate between water-soluble carbohydrate and ketone functional groups, and as a test for reducing sugars and non reducing sugars, supplementary to the Tollen's reagent test. The test was developed by German chemist Hermann von Fehling in 1849.〔
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==Laboratory preparation==
Fehling's solution is prepared by combining two separate solutions, known as Fehling's A and Fehling's B. Fehling's A is aqueous solution of copper(II) sulphate, which is deep blue. Fehling's B is a colorless solution of aqueous potassium sodium tartrate (also known as Rochelle salt) made strong alkali, commonly with sodium hydroxide. Typically, the L-tartrate salt is used. The copper(II) complex in Fehling's solution is an oxidizing agent and the active reagent in the test.
The deep blue active ingredient in Fehling's solution is the bis(tartrate) complex of Cu2+. The tartrate tetraanions serve as bidentate ligands giving the bistartratocuprate(II)6−.〔Albrecht, S.; Klüfers, P., "The Structural Chemistry of Text-Book Species: the Tartrato-Cuprates in Fehling's Solution", Z. Anorg. Allg. Chem. 2013, volume 639, 280-284. 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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