Starch test with iodine

                    STARCH TEST WITH IODINE

         

Introduction :
 
            This is an experiment to test the presence of starch content in any food item. In this experiment we are taking directly the starch powder.

Apparatus:

Test tube

Dropper

Iodine

Starch powder

Test tube holder 

Spatula

Procedure:

Step- 1:

Take a test tube and add some Starch powder in the testtube with the spatula. 

Step- 2:

Pour little water in the test tube using dropper. Shake well to become a fine solution. 

Step-3:

Add few drops of Iodine solution into the test tube.


Step-4:

We can observe that the starch solution changes and turns into black colour. 
      If we add iodine solution in normal water it remains in yellowish colour. 

Generalisation :
       

 We can test with more food items. Potato, Bread contains starch content. So they turns into black bluishcolour.

Conclusion :

In the same way we can test for milk etc; 

Watch this below video for understanding better: