Description
Fehling’s solution No. 2 is a chemical reagent used in analytical chemistry for the detection and quantification of reducing sugars, particularly aldoses such as glucose and fructose. It is composed of sodium potassium tartrate (Rochelle salt) dissolved in aqueous sodium hydroxide. Fehling’s solution No. 2 is typically clear and colorless. When mixed with Fehling’s solution No. 1 in equal volumes, it forms Fehling’s reagent, which is used in Fehling’s test for the qualitative determination of reducing sugars. In the presence of reducing sugars, Fehling’s reagent undergoes a redox reaction, resulting in the formation of a brick-red precipitate of copper(I) oxide.