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CHEMISTRY, PRINCIPLE AND PROCEDURE OF FEHLING'S TEST A chemical test called Fehling's test is used to distinguish between aldehydes and ketones as well as between reducing and non-reducing sugars. This test can also be used to discriminate between water-soluble carbohydrates and carbohydrates belonging to the ketone functional group. The Fehling Solution is created by combining two different solutions. The first is Rochelle salt produced strongly with sodium hydroxide, which is a colourless solution, and is known as Fehling A solution. The second is copper sulphate, which is a deep blue aqueous solution and is known as Fehling B solution. The Fehling Solution is created by combining the Rochelle salt and copper sulphate from the A and B solutions. Additionally, each of the solutions—A and B—are prepared independently and stored during the evaluation. FACEBOOK: www.facebook.com/CHEMTUTOR.718