Fehling's test

FEHLING’S TEST

This test is very specific for reducing sugars.

Principle

  • In this test, the reducing sugars produce a red colored Cu2O precipitate.
  • Sodium – potassium tartrate present in Fehling’s reagent, acts as the chelating agent.

Procedure

  • Mix equal volumes of Fehling’s A and B solutions in a test tube and add 1 mL of test solution.
  • Mix well and heat the tube gently over a flame.
  • Look for the presence of red colored cuprous oxide precipitate.

Experiment

Observation

Inference

 

 

 

Experiment

Observation

Inference

 

 

 

Experiment

Observation

Inference

 

 

Last modified: Saturday, 5 May 2012, 9:54 AM