Experiments

Experiment-3

Home AbstractInteresting facts on Sunlight Sunlight and Reflector Pigments as Reflectors
Plant Pigments Experiments Spectrophotometer SummaryBibliography and Acknowledgement
Navigation: Use vertical scroll bar to scroll through the page.

Objective:

To determine the color transmitted by chlorophyll.

Hypothesis:

If the color transmitted by the chlorophyll pigment is green then I should get a green colored glow on the screen underneath.

Material:

Caution:

Take help from an adult to handle rubbing alcohol. Keep it away from nose and mouth. My mother helped me to conduct this experiment.

Procedure:

pic3.jpg
(Source: Guide to more of the best science fair projects, page 43)

  1. Take about 50 ml of rubbing alcohol in a clear plastic cup. Add small pieces of a plant leaf by tearing the leaf.
  2. Keep on stirring the contents of the cup for about an hour and then remove the leaf pieces. Now the liquid containing plant pigments is ready for the experiment.
  3. Keep a white sheet of paper on the flat surface. This would be the screen.
  4. Hold the glass about 4 inches (10 cm) above the screen.
  5. Shine the light above the glass as shown in the figure on the left.
    (Figure Source: Guide to more of the best science fair projects, page 43)
    This is a home made spectrophotometer.
  6. The color seen on the screen is the color transmitted through the leaf pigment.

Result:

I observed a green colored glow on the screen.

Conclusion:

So the color transmitted by the chlorophyll pigment is green. Thus...

[The color transmitted]= [All the colors making up the white color] - [The colors absorbed]

Back to: Previous page
Top of the page
Back to page: List of experiments