Biography – Herman Von Fehling

Herman von Fehling was a German chemist, who developed Fehlings effect which was used for estimations of sugar. The Fehlings resoluteness is a chemical test used to differentiate between water-soluble carbohydrates and ketone functional groups, and as a test for monosaccharide. When working with Fehlings solution, Fehling took extra precautionary measurements when working in the laboratory. He created two separate solutions known as Fehlings A and Fehlings B.Fehlings A is a blue solution of Copper II, Sulfate, while Fehlings B is a clear solution of potassium, sodium, tartrate (Rhochelle Salt) and a strong bag (Sodium hydroxide). The volumes of the two mixtures are mixed to get the final Fehlings solution. In this mixture, the aqueous tartrate ions from the dissolved Rochelle salt ions from the dissolved Copper II sulfate, as bidentate ligands handsome bistartratocuprate II. The tartarate ions, by completing copper, prevent the formation of Cu(OH)2 from the reaction of CuSO42H2O and NaOH in the solution.Fehlings solution is an oxidizing agent in the Bistartratocuprate II and the active reagent in the test. The merge being tested is added to Fehlings solution and the mixture is heated. The aldehydes are oxideized, giving a positive conduce, but ketones do not reacte, unless they are alpha-hydroxy-ketones. The bistratratocuprate II is a complex oxidizes the aldehyde to the carboxylate anion, and in the process the copper II ions of the xomplex are reduced to Copper I ions.A negative result is the absence of the red precipitate Fehlings will NOT work with aromatic aldehydes in that fictitious character Tollens reagent a chermical reagent most commonly used to determine whether a known carbonyl contation compound is an aldehyde or a ketone, a positive test with Tollens reagent sults in elemental silver hurriedness out of solution, occasionally outo the interior surface of the tube, productiona characteristic and memorable silver mirror on the inner serface should be used.Fehlings earlier work included investigations of succinic acid, spirit of amber (white, odorless material plays a role in citric acid cycle, an energy-yielding process) and the preparation of phenyl cyanide (benzonitrile organic compound, with a scented almond odor). After many scientific discoveries or investigations Fehling started to lean more towards technology and public wellness rather than interpersonal chemistry.Fehling started to work with estimation of sugars (Fehlings Solution) which was a solution of copper sulfate mixed with alkali and potassium sodium tartrate (Rochelle Salt). Fehling was born June 25, 1812 and died July 1, 1885, Fehling attended Heidelberg University around 1835 with the intention of taking pharmacy when entering. After grade he went to Gieben as a preparateur to Justus von Liebig, whom he created the composition of paraldehyde and metdehyde.After his discover with Sugar he contributed into the composition of Graham-Otto Textboo k of Chemistry & Handworterbuch with Friedrich Wholer and Johann Christian Poggendorff. Fehling became a member of the committee of the Pharmacopoeia Germanica and he was appointed to the chair of chemistry in the polytechnic in Stuttgart for 45 years. He died in Stuttgart in 1885.