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Lesson 3: Let's Investigate!
  • 3.0.0 Finding answers to some questions
  • 3.1 High blood pressure
  • 3.1.1 What causes high BP?
  • 3.1.2 How is BP measured?
  • 3.1.3 How common is high BP and low BP?
  • 3.1.4 Observations from Survey
  • 3.2 Smoking
  • 3.2.1 Lungs of people who smoke
  • 3.2.2 Lung capacity of smokers and non-smokers
  • 3.2.3 Lung capacity of smokers and non-smokers
  • 3.2.4 Your question, Your investigation! - Smoking
  • 3.3 Anaemia
  • 3.3.1 Iron-deficiency can cause Anaemia
  • 3.3.2 Food sources of iron
  • 3.3.3 Food sources of iron
  • 3.3.4 Your question, Your investigation! - Anaemia

    Food sources of iron

    Experiment:

    1. Add 3 to 4 spoons of tea leaves in one litre of water and boil it.

    2. Filter this tea water and store the water in a container.

    3. Take one cup of this tea water from this for the first experiment.

    4. Make a separate solution of the item whose iron content is to be tested, and then filter it using a strainer so that there is no solid part in it. For example, mix 5 grams of jaggery in 10 ml of water and then filter it.

    5. Mix this solution with one cup of tea water.

    6. Keep it aside for 40 to 45 minutes. Is there any change visible in the tea water solution?

    7. After 45 minutes strain this mixture through a filter paper (Whatman number 1) after fitting it in either a funnel or a plastic tea strainer.

    8. It may take 30 minutes or more to strain this mixture. Let the filter paper dry completely once the process is complete.

    What did you see on the filter paper?

    If there is any black residue on the filter paper, then it indicates the presence of iron.

    Note:

    -If the substance does not dissolve easily, then you can grind it and then dissolve it in water or extract its juice out and then do the experiment.
    -You can find filter paper in a store selling laboratory ingredient or in your school laboratory.
    -If there is no distilled water, then you can store rain water in a clean vessel.


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