HUMAN NUTRITION

Detailed explanation-1: -Fehling’s solution is prepared by combining two separate solutions: Fehling’s A, which is a deep blue aqueous solution of copper(II) sulfate, and Fehling’s B, which is a colorless solution of aqueous potassium sodium tartrate (also known as Rochelle salt) made strongly alkali with sodium hydroxide.

Detailed explanation-2: -Fehling solution A is a blue aqueous solution of copper(II) sulphate, while Fehling solution B is a clear and colorless solution of aqueous sodium potassium tartrate (also known as Rochelle salt) and a strong alkali (commonly NaOH).

Detailed explanation-3: -Fehling A is an aqueous solution of copper sulphate. It is prepared by dissolving pentahydrated copper sulphate in distilled water and then adding some drops of dilute sulphuric acid. Fehling A is also blue in colour. The copper present in solution A imparts blue colour to Fehling A solution.