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1.3

Minor Versionm

by Procheta Mallik

Introduction

Pick small samples (a pinch or two) of food items from home - rice, corn, groundnut, pulses, wheat, carrot, etc and cook them at home.

1. Crush each of them on a white paper and check after drying if the paper becomes transparent.

2. Mix the food item with given ethanol. Filter it in a transparent plastic bottle and add water.

    • Conduct the experiment under adult supervision.

    • Keep ethanol away from heat, sparks, open flames and hot surfaces.

    • Wear Gloves when handling ethanol.

    • Avoid Skin contact with ethanol

    • Do not breathe ethanol vapours

    • Wash your hands thoroughly after the experiment

  1. Take 3 to 5 drops of coconut oil in test tube. Using dropper, add 3 ml of ethanol and shake it well. Leave the mixture for two minutes
    • Take 3 to 5 drops of coconut oil in test tube.

    • Using dropper, add 3 ml of ethanol and shake it well.

    • Leave the mixture for two minutes

  2. Add water to the mixture in same quantity as ethanol added. Shake it well. The Mixture will turn into cloudy white emulsion, confirming the presence of fat in the oil.
    • Add water to the mixture in same quantity as ethanol added. Shake it well.

    • The Mixture will turn into cloudy white emulsion, confirming the presence of fat in the oil.

    • Clean the test tube well at the end of each trail.

  3. Take some peanuts and peel off its skin. Crush the peanuts with a flat surface.
    • Take some peanuts and peel off its skin.

    • Crush the peanuts with a flat surface.

  4. Take the crushed peanuts in a beaker and add some ethanol so that it can soak in. Use Stirrer to mix it well and leave for few minutes.
    • Take the crushed peanuts in a beaker and add some ethanol so that it can soak in.

    • Use Stirrer to mix it well and leave for few minutes.

  5. Place the filter paper on funnel and place the funnel over the test tube. Pour some mixture from the beaker onto to the funnel and let it filter out the solution. Pour some mixture from the beaker onto to the funnel and let it filter out the solution.
    • Place the filter paper on funnel and place the funnel over the test tube.

    • Pour some mixture from the beaker onto to the funnel and let it filter out the solution.

  6. Pour equal amount of water to the solution in the test tube and shake it well. The Mixture will turn into cloudy white emulsion, confirming the presence of fat in the oil.
    • Pour equal amount of water to the solution in the test tube and shake it well.

    • The Mixture will turn into cloudy white emulsion, confirming the presence of fat in the oil.

  7. Take a piece of lemon and squeeze it into a beaker containing water. Stir it well and leave for few minutes
    • Take a piece of lemon and squeeze it into a beaker containing water.

    • Stir it well and leave for few minutes

  8. Follow the process from Step 5 to  filter out the solution in a test tube. Using dropper, add some ethanol to it. The mixture will remain colorless, confirming the absence of fats in lime water.
    • Follow the process from Step 5 to filter out the solution in a test tube.

    • Using dropper, add some ethanol to it.

    • The mixture will remain colorless, confirming the absence of fats in lime water.

    • The Color you see in test tube is the color of concentrated lemon extract.

    • Too much ethanol

    • Too much water.

    • Sample not dissolved in ethanol

    • Residual fat in test tube from previous trials will trigger false positives - Use clean or fresh test tube

    • Why does the color change happens? Can you figure out the science behind it ?

    • Conduct test on different types of fruits and vegetables

    • Conduct test on common cereals you eat for breakfast

    • Conduct test on cooked rice

Finish Line

Kailash NR

Member since: 05/02/2017

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