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Q: Why is NaOH added in starch iodine test?
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What is the chermical you test for starch?

Starch has high affinity for Iodine and in presence of iodine crystals starch turns blue from being colourless. This the fundamental that is used for chemically identifying the starch.


What is used to test for presence of polysaccharide?

Most likely the sucrose test. what biologist use is the iodine test. Iodine is used to test for the presence of starch( a polysaccharide) any material containing starch always turn blue-black when iodine is added.


Why did the leaf turn blue black when iodine was added in the starch test?

because photosynthesis has occured in the leaf. starch is produced and turns iodine blue-black indicating the presence of starch.


What is the purpose for iodine test?

The Iodine test is used to test for the presence of starch.


What does iodine detect?

The iodine test is used to test for starch. It reacts with starch to produce a purple blackish color.


What organic molecule does iodine test for?

They test for carbohydrates. The Iodine reagent tests for starch. The Benedict's reagent tests for small sugars. Most carbohydrates are are made of sugar, and starch is a type of carbohydrate.


What is the chemical used to test for the presence of starch?

The chemical used to test for the presence of starch is iodine.


How starch can give a negative iodine test?

Starch can give a negative iodine test when starch is mixed with iodine in water. The iodine gets stuck in the coils of beta amylase molecules and the starch forces the iodine atoms into a linear arrangement in the central groove of the coil.


What chemical reagent tests for starch?

The simplest test is the iodine test.


What substance does Iodine test for?

carbohydrates, for one


Why use iodine solution to test for starch?

The test is positive with starch because the iodine takes up a position in the centre of the starch helix which is blue black.


What is the iodine test used to test for?

If the food has starch or not