Why we dip a leaf into acid before testing of iodine
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Explanation:
Because the hot water kills the leaf and the alcohol breaks down the chlorophyll, taking the green color out of the leaf. When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch.
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haha, it is boiling alcohol, not acid, mate, anyways, alcohol removes all the green pigment/chlorophyll from the leaves, which makes it less easy to detect the places where starch had been stored, to carry out the experiment. after losing all it's colour, the iodine blackens the patches on the leaf where starch was present.
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