Procedure:
Results: The image on the top left is the results I obtained from carrying out this experiment and the photo on the top right is a scale showing how the hydrogen carbonate indicator reacts to different pH levels. As we can see the glass vial that was left out without a colored filter around it turned a deep purple color and from the scale this suggest that the pH in that vial was around 8.5. This is because since all wavelengths of light were allowed into the vial so that the alga in their could photosynthesize to their full ability and the production of CO2 coming from that photosynthesis is what caused the change of pH within the vial.
However as we can see with the vial which had the green filter on, the color has stayed yellow suggesting a pH of around 7.9. This is because that the green filter was inhibited all wavelengths of light other than those in the green spectrum. As we can see on the below graph, the pigments within the chloroplasts responsible for photosynthesis are unable to absorb light in the green spectrum (around 520-550 nm) and since the alga cannot photosynthesis, CO2 isn't produced to alter the pH level of the solution like with the vial without the filter.
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Jack BojanArdingly College Archives
March 2017
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