How to test for starch?

Answer 1

A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change.

Answer 2

To test starch,we can use iodine solution.It is called an iodine test.however there are many steps to do before testing it with the solution.

step 1:Put the green leaf into boiling water for 2 minutes(to kill the leaves cell and allows iodine solution to be added later)

step 2:Put it into a test tube with alcohol and boil it in boiling water for 10 minutes(to remove chlorophyll)

step 3:Put it into a boiling tube of hot water.Use a glass rod to wash it(to wash away the alcohol and make the leaf soft)

step 4:You can finally add a drop of idoine solution of it.If it turns to dark blur,it contains of starch.

Answer 3

1. Place a small amount of starch powder in a test tube filled with cold water

2. Boil it to make a clear solution

3. Once the solution has cooled off, you should put 3 or 4 drops of iodine solution in it.

4. The solution should turn dark blue.

Answer 4

Add a small amount of idodine to the food and it will turn dark blue-purple if there is a prescence of starch

Answer 5

Place a few drops of iodine on the foods you are testing and if they contain starch the iodine drops will turn dark purple.