Is Benedict and Fehling same?
Fehling’s solution and Benedict’s solution are variants of essentially the same thing. Benedict’s solution contains copper(II) ions complexed with citrate ions in sodium carbonate solution. Again, complexing the copper(II) ions prevents the formation of a precipitate – this time of copper(II) carbonate.
What is the difference between Fehling solution A and B?
Fehling’s Solution. Fehling’s A is a solution containing copper(II) sulphate, which is blue. Fehling’s B is a clear liquid consisting of potassium sodium tartrate (Rochelle salt) and a strong alkali, usually sodium hydroxide.
What test reagent is most sensitive in detecting sugar in the urine?
The Benedict’s test identifies reducing sugars (monosaccharide’s and some disaccharides), which have free ketone or aldehyde functional groups. Benedict’s solution can be used to test for the presence of glucose in urine.
Which is more stable Benedict’s or Fehling’s reagent?
The citrate complex in Benedict’s reagent is much more stable that Cu (OH)X2, so Benedict’s reagent doesn’t precipitate on standing for long, unlike Fehling’s. This is quite advantageous since you wouldn’t have to mix two solutions together to perform the test. This is where Benedict’s reagent is quite handy.
What’s the difference between Fehling’s A and B?
The chemical test used for this differentiation is known as Fehling’s test. Fehling’s solution is prepared by mixing two solutions together. The two solutions are named as Fehling’s A and Fehling’s B. Fehling’s A has a deep blue color due to the presence of hydrous copper (II) sulfate (CuSO 4 .5H 2 O).
What can give a positive result for Benedict’s test?
Any chemical compound that is a reducing agent can give a positive result for Benedict’s test. Benedict’s solution has a dark blue color. This is due to the presence of copper(II) sulfate(CuSO 4.5H 2O). A reducing sugar can reduce the copper ion in this solution into copper oxide, which is a red colored precipitate.
What do you need to know about Fehling’s solution?
What is Fehling’s Solution. Fehling’s solution is a blue solution of Rochelle salt and copper sulfate used as an oxidizing agent in a test for sugars and aldehydes. It is a chemical reagent that is useful in identifying reducing sugars.