Question

what are the major precautions you need in the experiment of presence of the starch?​

Answer 1

Heat it. after boiling the leaf, wash it in water to remove alcohol. Then pour dilute iodine solution over the leaf. You can see it has turned blue-black which indicates the presence of starch.

Answer 2

Answer:

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Explanation:

A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test.

Safety Precautions:-

1. Use test-tube holder for holding the test tubes and keep the mouth of the test tube away from yourself while heating.

2. Use clean test tubes.

3. Do not use too much of iodine solution.

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