Site Navigation

Your Account

Choose Language

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

    Add Comment

  1. Take 3 to 5 drops of coconut oil in test tube.
    • 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

    Add Comment

    • 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.

    Add Comment

    • Take some peanuts and peel off its skin.

    • Crush the peanuts with a flat surface.

    Add Comment

    • 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.

    Add Comment

    • 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.

    Add Comment

    • 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.

    Add Comment

    • Take a piece of lemon and squeeze it into a beaker containing water.

    • Stir it well and leave for few minutes

    Add Comment

    • 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.

    Add Comment

    • 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

    Add Comment

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

    Add Comment

    • Conduct test on different types of fruits and vegetables

    • Conduct test on common cereals you eat for breakfast

    • Conduct test on cooked rice

    Add Comment

Finish Line

Kailash NR

Member since: 05/02/2017

2,989 Reputation

71 Guides authored

0 Comments

Add Comment