Skip to main content
Select Source:

Fehling's test

Fehling's test A chemical test to detect reducing sugars and aldehydes in solution, devised by the German chemist H. C. von Fehling (1812–85). Fehling's solution consists of Fehlings A (copper(II) sulphate solution) and Fehling's B (alkaline 2,3-dihydroxybutanedioate (sodium tartrate) solution), equal amounts of which are added to the test solution. After boiling, a positive result is indicated by the formation of a brick-red precipitate of copper(I) oxide. Methanal, being a strong reducing agent, also produces copper metal; ketones do not react. The test is now little used, having been replaced by Benedict's test.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Fehling's test." A Dictionary of Biology. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

"Fehling's test." A Dictionary of Biology. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/fehlings-test

"Fehling's test." A Dictionary of Biology. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/fehlings-test

Fehling's test

Fehling's test (fay-lingz) n. a test used for detecting the presence of sugar in urine; it has now been replaced by better and easier methods. [ H. von Fehling (1812–85), German chemist]

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Fehling's test." A Dictionary of Nursing. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.

"Fehling's test." A Dictionary of Nursing. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/fehlings-test

"Fehling's test." A Dictionary of Nursing. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/fehlings-test