Question

Why is there a change in colour in test tubes? give short ans​

Answer 1

Answer:

China rose indicator turns magenta in acidic solution, no change in neutral solution and green in basic solution. Therefore, test tube I contains an acidic solution (lemon juice), test tube III contains basic solution (lime water). As test tube II shows no change in colour so, it contains a neutral solution (sugar solution)

Explanation:

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Answer 2

The test tubes that have a change in color will mean that they had a reaction occur still and the cofactor that that chelating agent binds to, is not a cofactor of catcholase. ... Since citric acid is a natural preservative found in foods, the copper will be the cofactor of the enzyme catecholase.

Hope this helps....