Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev

Science Class 9

Class 9 : Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev

The document Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev is a part of the Class 9 Course Science Class 9.
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Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev
Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev
Procedure - To Test the Presence of Starch in Potato, Biology, Science, Class 9 Class 9 Notes | EduRev
 

Real Lab Procedure

  • Place a potato on a tile.

  • Grind or chop the potato into small pieces, using a knife.

  • Using a spatula transfer these pieces of potato into a beaker.

  • Pour some distilled water into the beaker.

  • Place the beaker containing the mixture over a hot plate.

  • Heat the mixture for 5 minutes while continuously stirring it with a glass rod.

  • Take another beaker and cover its mouth with a muslin cloth.

  • Secure the muslin cloth around the mouth of the beaker by tying it with a thread.

  • Filter the solution through this beaker.

  • Now take a clean test tube and pour some of the filtrate into it.

  • Take a few drops of iodine solution using a dropper.

  • Add a couple of these drops into the test solution.

Simulator Procedure (as performed through the Online Labs)

  • You can select the type of test from the ‘Select type of the test’ drop down list.

  • To select a particular food sample, click on the corresponding icon.

  • Click and drag the dropper towards the food sample to pour a few drops of Iodine solution into the test sample.

  • Then drag the dropper back to place it in the Iodine bottle.

  • Based on your observation, you can indicate the presence of starch in the selected sample by clicking on the 'Yes' or 'No' radio button.

  • You can redo the experiment by clicking on the ‘Reset’ button.

Note: If the solution turns to blue-black colour it indicates the presence of starch in the solution.
 

Observation

The test solution turns blue-black in colour.
 

Inference

Iodine reacts with starch to form starch/iodine complex which has a blue-black colour. The appearance of blue-black colour confirms the presence of starch in the given food sample.
 

Precautions

  • While using iodine solution, be careful, as it is toxic if swallowed or inhaled.

  • While heating, care should be taken that the solution does not splash on your face.

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