Sugar Test Experiment is a photograph by Andrew Lambert Photography which was uploaded on May 7th, 2013.
Sugar Test Experiment
MODEL RELEASED. Fehling's test for sugars. Student heating a test tube containing glucose (a simple sugar) and Fehling's reagent. The brown colour is... more
Title
Sugar Test Experiment
Artist
Andrew Lambert Photography
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Photograph
Description
MODEL RELEASED. Fehling's test for sugars. Student heating a test tube containing glucose (a simple sugar) and Fehling's reagent. The brown colour is a positive result for the presence of an aldehyde group, a chemical structure found in sugars. The Fehling's reagent contains copper ions, giving it its blue colour. The copper ions oxidize the sugar and are themselves reduced to a lower oxidation state in copper oxide (brown). This change in the oxidation state is what causes this colour change. Fehling's reagent is a mixture of the two bottled reagents seen A (copper sulphate solution, blue) and B (alkaline potassium sodium tartrate, clear).
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May 7th, 2013
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