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I See! Vitamin C!

Mary Colvard

Part One   Data Sheet for Part One   Teacher Notes

Part Two

"What are some other variables that may impact on vitamin C levels?"

Background

Now you are ready to design your own experiment. There are some suggestions below you may choose from or if you have another idea, describe it to your teacher before setting it up. You may use the available foods and chemicals or bring in your own.

  1. Determine the effect of pH on Vitamin C content of orange juice.
    Things to consider if you choose this experiment:
    1. How are you going to have a control in this experiment?
    2. What type of acid/base will you use?
    3. How much acid/base will you add to how much juice? Does it matter?
    4. What information needs to be recorded?
    5. Are there other factors you need to consider?

  2. Determine the effect of light on the vitamin C content of orange juice.
    Things to consider if you choose this experiment:
    1. How you are going to vary the amount of light to which the juice is exposed?
    2. What will you use for your light source?
    3. For how long are you going to expose the juice?
    4. What information needs to be recorded?
    5. Are there other factors you need to consider?

  3. Determine the vitamin C content of assorted vegetables and fruits.
    Things to consider if you choose this experiment:
    1. How are you going to convert solid fruits and vegetables into liquids?
    2. How can you standardize these preparations so that they contain relatively equal amounts of fruit or vegetable material per unit of volume?
    3. What information needs to be recorded?

  4. Determine the effect of heat processing on the Vitamin C content of foods.
    Things to consider if you choose this experiment:
    1. Are you going to use processed foods or process your own?
    2. If you process your own, how are you going to prepare and treat the samples?
    3. What safety measures need to be considered?
    4. What information needs to be recorded?

  5. Perform a cost analysis to find out which orange juice is most economical, based on its Vitamin C content.

Part Two Report

Before doing the lab, submit the following information to your teacher:
  1. What question will you try to answer with your experiment?
  2. Describe your experimental procedure.

After conducting the experiment, submit a final report which includes, as appropriate, the initial question, hypothesis, methods, materials, and results containing a data table, and a discussion including:
  1. What conclusions can be made based on the results of your experiment?
  2. What especially surprising information did you discover as a result of your investigation?
  3. What could be done to make your procedure and/or findings more reliable?
  4. As a result of your investigation, what questions do you have that need to be answered through further experimentation?
Part One   Data Sheet for Part One   Teacher Notes


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