A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is lik...

Assessment: WAEC SSCE - Biology - 2011 (Objective) Subject: Biology

Question 1 Report

A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a
Answer Details
The food substance is likely to be a protein. When sodium hydroxide solution and a drop of copper sulphate solution are added to a protein, it forms a violet or purple color. This is due to the formation of a complex between the copper ions and the peptide bonds in the protein molecules. The intensity of the color depends on the concentration of the protein in the solution.
Read lesson note on Nutrition (JAMB)
Read lesson note on Cell Structure (WAEC)
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