Fehling’s Test: Procedure
The procedure for Fehling’s test is:
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Put approximately 1 mL of Fehling’s A and 1 mL of Fehling’s B in a clean dry test tube.
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Add 2-3 drops of the liquid sample into the test tube.
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Heat the content of the test tube for about 2 minutes in a heated water bath.
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Formation of a brick-red precipitate of cuprous oxide indicates the presence of a reducing sugar.
Figure 1 - Fehling's test procedure for detecting the presence of reducing sugars in a sample.