Photosynthesis Classwork

Introduction:  Photosynthesis is the process whereby plants using light energy from the sun convert carbon dioxide and water to glucose sugar and oxygen gas through a series of reactions. The overall equation for photosynthesis is

carbon dioxide + water =light energy=> glucose + oxygen

6CO2 + 6H2O =light energy=> C6H12O6 + 6O2

Add a pinch of baking soda to the water in the test tube. Cut elodea stems at an angle and use your fingers to crush the end of the stem. The water in the beaker is meant to absorb the heat from the light. Phenol red is used as an indicator for a base. With excess carbon dioxide the solution becomes acidic and the phenol red will be yellow; as the carbon dioxide is removed the solution becomes more basic, turning back to red.

Photosynthesis Experiment: Remove the elodea from your test tube and rinse to remove any sodium bicarbonate from the plant and the test tube. Place dilute phenol red in the test tube.  Use a straw to bubble breath into the tube until the solution turns yellow. Place the tube in from of the lamp, observe the tube and note any changes in color. After gathering data on the color change, reset your test tube back to yellow and then cover it in foil. Store this overnight and check the color the next day. 

Carbon Dioxide Experiment: Phenol red is used as an indicator for a base. With excess carbon dioxide the solution becomes acidic and the phenol red will be yellow; as the carbon dioxide is removed the solution becomes more basic, turning back to red.

 Conclusion: Overall, This project had an impact on me because it was very informational and helped us to see how photosynthesis looks and watch it happen. 

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