Fehling liquor: The Fehling reaction is a reaction commonly used to characterize aldehydes by their oxidation with copper II ions.
Essentially, Fehling's liquor (or Fehling's solution) contains copper(II) ions complexed with tartrate ions in a basic medium. The tartrate ions make it possible to maintain the copper (II) ions in solution at a pH at which they would be precipitated in the form of Cu(OH) hydroxide if they were not complexed. The copper (II) ions constitute...
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