Question

what is the positive way of starch​

Answer 1

Answer:

Explanation:

If you are testing to see if starch is present, then a positive test means it is present.

You will use iodine to test if starch is present. More specifically, you will use a solution of I2 in KI. In this solution, the tri-iodide ion forms. When this is added to something containing starch, the tri-iodide ion slips inside helical starch molecules, and this complex absorbs most of the light, turning dark blue-black.

So a positive test will be seen by a dark colour appearing.

This test can be reversed, if you need to detect iodine. Starch is used to detect iodine, giving the same dark colour.

Answer 2

Answer:

Iodine solution, a brown solution, when in contact with starch turns blue-black. This is due to ions forming a complex with the amylose helix, a component of starch. The blue-black colour will indicate a “positive” test, meaning that the compound you are looking for (starch) is present in the sample.

Explanation:

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