dextrose equivalent (DE) of the starch sugar. Formic acid (HCO2H) also gives a positive Fehling's test result, as it does with Tollens' (eponymous for
In organic chemistry, Fehling's solution (/'feɪlɪŋ/, FAY-ling) is a chemical reagent used to differentiate between water-soluble carbohydrate and ketone (>C=O) functional groups, and as a test for reducing sugars and non-reducing sugars, supplementary to the Tollens' reagent test. The test was developed by German chemist Hermann von Fehling in 1849.
In…
and 1,2-dicarbonyls. Both Tollens' reagent and Fehling's reagent give positive results with formic acid.[citation needed] In anatomic pathology, ammonical
Tollens' reagent (chemical formula Ag(NH3)2OH) is a chemical reagent used to distinguish between aldehydes and ketones along with some alpha-hydroxy ketones which can tautomerize into aldehydes. The reagent consists of a solution of silver nitrate, ammonium hydroxide and some sodium hydroxide (to maintain a basic pH of the reagent solution). It was named after its discoverer, the German chemist Be
Ag2O…
2 [Ag(NH3)2]+ + RCHO + H2O → 2 Ag + 4 NH3 + RCOOH + 2 H+
Tollens' reagent can also be used to test for terminal alkynes (RC2H). A white precipitate of the acetylide (AgC2R) is formed in this case. Another test relies on reaction of the furfural with phloroglucinol to produce a colored compound with high molar absorptivity. It also gives a positive test with hydrazines, hydrazones, α-hydroxy ketones and 1,2-dicarbonyls.
Both Tollens' reagent and Fehling's reagent give positive results with formic acid.
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