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An Investigation To Show How the Amount Of Sodium Hydrogen Carbonate Affects The Rate Of Photosynthesis In Pond Weeds.

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Introduction

An Investigation To Show How the Amount Of Sodium Hydrogen Carbonate Affects The Rate Of Photosynthesis In Pond Weeds. Investigation Outline: An experiment was planned and carrier out where the concentration of carbon dioxide available to a water plant was changed by varying the concentration of NaHCO in the water. However all the other factors that may have affected the rate of photosynthesis were carefully monitored and controlled. E.g. light intensity and temperature. Hypothesis: I predict that when the concentration of sodium hydrogen carbonate increase the rate of photosynthesis in the plant will also increase or 'speed up'. Results: Concentration of NaHCO Volume of O produced in Volume of O produced in (mol/dm3) 240 minutes cm3 240 minutes cm3 0 1.8 2.1 0.1 6.2 6.9 0.2 11.8 11.1 0.3 17.9 18.2 0.4 23.7 22.9 0.5 24.4 23.9 Calculations to show average oxygen production in 60 minutes (cm3): (1.8 + 2.1) /2 = 1.95/4 = 0.5 (6.2 + 6.9) /2 = 6.55/4 = 1.6 (11.8 + 11.1) /2 = 11.45/4 = 2.9 (17.9 + 18.2) /2 = 36.1/4 = 4.5 (23.7 + 22.9) ...read more.

Middle

Whereas the other concentrations were significantly increased compared to there predecessors. This leads me to believe that the rate of oxygen will no longer increase as the concentration of NaHCO is increased I believe this is because the NaHCO is no longer a limiting factor of the reaction. These results are what I expected as they do agree with my hypothesis. The increase in rate of photosynthesis because the more sodium hydrogen carbonate that was present meant there was more carbon dioxide readily available to the plant so it could reduce the carbon dioxide by the hydrogen that is present in the enzymes inside the chloroplast of the plants leaves and therefore speeding the rate of photosynthesis up and therefore leading to a greater rate of oxygen production in a given time. However in part (b) of the graph its seems to start to level out because there is only one result that shows this I am not able to state whether this could be due to anomalies (if this proves to be the case we would have to carry out another experiment with a greater range of results) ...read more.

Conclusion

then the carbon molecules will also be able to be reduced by the hydrogen molecules and so increasing the rate of photosynthesis. Another limiting factor of this reaction could be the temperature. If this is so this could mean the plants enzymes are unable to work at their optimum temperature and therefore working at a slower rate that causes the rate of reaction to decrease which will end up in a lower production of glucose molecules. Evaluation: Overall, I believe this experiment to be a fairly accurate and successful one as my result support my prediction. However if I were to do this experiment again I would try to keep the temperature at a constant because I am still unsure of the limiting factor in this experiment. To do this I could place the experiment in a water bath of a constant temperature. If I was to do this I would be sure of which limiting factor affected this experiment. Also I could try out various sizes of pond weed as larger pieces would have a larger surface area and a greater number of palisade cells available to the light and this would have an effect on the rate of photosynthesis. ...read more.

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