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Question

What is Benedict’s test?


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Solution

Benedict’s test:

  • It is a chemical test that is used to check the presence of reducing sugars.
  • The functional group in simple carbohydrates are free ketone or aldehyde which can be identified by this test.
  • This test is based on Benedict’s solution or reagent (which is a complex mixture of sodium citrate, sodium carbonate, and the pentahydrate of copper(II) sulfate), which is an alkaline solution that contains copper sulphate, sodium citrate and sodium carbonate.

Benedict’s test principle:

  • When reducing sugars are exposed to Benedict’s solution, then it results in the formation of brick-red precipitate that indicates a positive test.
  • The chemical reaction is shown below in the image.

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