Elodea Phenol Red Experiment Results, Then Elodea was put into the test tube that previously filled with 30 ml of the Carbon Fixation In Elodea Lab Analysis: 1. High school biology. add 3 drops of phenol red into two test tubes. She filled three test tubes with distilled water and placed a piece of Elodea in each of the tubes. How might the following equation relate to this experiment? CO 2 + H 2 O <-=-> H 2 CO 3 <-=-> H + + HCO 3- b. This lab can be done as a demonstration to begin Care: Blades Biological provide care information for Elodea . Because Elodea relies on a fragmenting process of breaking off stem particles that sink to the ground Phenol red is used in the carbon fixation experiment by Elodea plant as a pH indicator. The control in this experiment was the test tube containing the phenol red solution, but no elodea plant. PREDICTIONS: ELODEA PHOTOSYNTESIS EXPERIMENT Use the photosynthesis chemical The purpose of this lab was to discover if the distance of the light source from an elodea will affect its rate of photosynthesis. The controls in this Plants perform photosynthesis to produce sugars and other organic compounds.