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# Lab on Photosynthesis

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Introduction

Lab on Photosynthesis Aim: To test what effect CO2 concentration has on the rate of photosynthesis; by placing an Elodea plant in water solutions with varying amounts of CO2 due to varying amounts of Sodium Hydrogen Carbonate (NaHCO3) and observing the number of bubbles of oxygen that are released as a bi-product of photosynthesis Hypothesis: As the concentration of CO2 increases the rate of photosynthesis will increase, until a certain point where the rate of photosynthesis will become constant because of other limiting factors on photosynthesis. The equation for photosynthesis is - 6H2O +6CO2 --> C6H12O6 + 6O2 Water + carbon dioxide --> glucose + water As carbon dioxide increases in an environment with an adequate water supply photosynthesis should increase so more oxygen will be produced; eventually the rate of photosynthesis will be limited by aspects such as temperature and amount of light present. Variables: Independent Variables: * Amount of CO2 in water due to concentration of NaHCO3 placed in water Dependent Variables: * The number of bubbles which rise from Elodea plant in 10 minutes Constant Variables: * Time in which experiment is rate of photosynthesis is observed (10 minutes) ...read more.

Middle

in the 10 minutes 13. Steps 7 - 12 were repeated 3 times so that all 5 beakers with varying concentrations of CO2 being observed Diagram: Pictures of Experiment Results: Table 1/ Number of Oxygen Bubbles due to Percentage of NaHCO3 Percentage of Carbon solution Number of Bubbles 0.0 44 (+ or - 2) 0.1 56 (+ or - 2) 0.2 78 (+ or - 2) 0.3 101 (+ or - 2) 0.4 128 (+ or - 2) Table 2/ Rate of Photosynthesis due to Percentage of NaHCO3 Percentage of Carbon Solution Rate of Photosynthesis (Amount of Bubbles per minute) 0.0 4.40 (+ or - .2) 0.1 5.60 (+ or - .2) 0.2 7.80 (+ or - .2) 0.3 10.1 (+ or - .2) 0.4 12.8 (+ or - .2) Data Analysis: Calculations for rate of photosynthesis For 0.0% Number of Bubbles / time = rate of photosynthesis 44/ 10= 4.4 bubbles per minute For 0.4% Number of Bubbles / time = rate of photosynthesis 128/ 10= 12.8 bubbles per minute Calculations for absolute error Error of Number of Bubbles / Time (+ or - 2) / 10 = + or - .2 Graph: Graph1/ Rate of Photosynthesis of Elodea plant in water with varying concentrations of Sodium hydrogen Carbonate Conclusion: Graph 1 shows the results. ...read more.

Conclusion

For example in one beaker the funnel appeared cloudier then the other which would have reduced the amount of light being received by the Elodea plant. This problem could be easily resolved by having better equipment where the funnels were exactly the same shade and one larger and longer light such as a florescent light tube. The consistency of the water could also be an opportunity for error because if the carbon solution and the water in the beaker didn't mix equally and the plant water under the funnel didn't have the added carbon water; the results would be an inaccurate representation of the experiment. The time in which the experiment was also a limiting factor because the whole experiment was conducted in 80 minutes it meant one was rushed to set up and do the experiment, if one had a longer period of time in which to conduct the experiment many mistakes and careless errors could be overcome by being given the time to correct are mistakes. Also if we did the experiment for more solutions it would be more accurate. Overall the experiment worked and shows the general trend but if the experiment was improved it could be a much more accurate representation. ...read more.

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