what happens when you pu iodine on potato/sugar please explain it too!!
Answers
Answer:
A test to distinguish starch from glucose is to shine a beam of light through 'solutions' of each.
This is also called the Tyndall Beam Effect. Dispersal only happens in starch as the large starch molecules are big enough to affect the light. This is a physical test.
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. For example, if iodine is added to a peeled potato then it will turn black.
Benedict’s reagent can be used to test for glucose. The test involves heating a solution of the sugar to be tested with Benedict’s reagent and observing the colour change of blue to orange.
Benedict’s reagent will give a positive test result for glucose but not for starch.
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Answer:
When we drop iodine on potato the area which come under the contact of iodine solution will turn blue - black due to presence of starch.
This practice is known as starch test