Take 2 drops of 2%copper sulphate solution in a test tube. add 10 drops of 10% sodium hydroxide solution to it and shake well. add an egg white to it. mix them well.
1. what do you observe?
2. what change do you observe in the colour?
Answers
Answered by
5
Answer:
proteins
Explanation:
When two drops of copper sulphate and ten drops of caustic soda or NaOH is added to egg, it turns violet. This indicates the presence of proteins.
This is Biuret's test and the principle is simple as follows:
In the presence of alkaline medium (caustic soda or NaOH), the Cu
2+
ions get reduced to Cu
+
and binds to the egg proteins, thereby giving a violet color.
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