Portrait of Hermann von Fehling, 1812-1885

Portrait of Hermann von Fehling, 1812-1885

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Credit: SCIENCE PHOTO LIBRARY

Caption: Portrait of the German organic chemist Hermann Christian von Fehling, 1812-1885. Fehling was a pupil of Liebig, an eminent German chemist, and later taught in Stuttgart. He is best known for the test reagent Fehling's solution, which contains a deep blue copper(II) complex in aqueous alkaline solution. If this gives a brick-red copper(I) oxide on boiling with the organic test sample the presence of an organic aldehyde or reducing sugar is indicated. Some other organic substances also give a positive result, however.

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Keywords: aldehyde test, chemist, fehling, fehling's reagent, hermann, hermann von, inventor, organic chemist, portraits, surname f, von fehling

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