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Investigate the affects that different concentrations of sodium hydrogen carbonate on the rate of photosynthesis.

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Introduction

Sc1 Investigation: Biology Aim: To investigate the affects that different concentrations of sodium hydrogen carbonate on the rate of photosynthesis. Plan: Background Research Photosynthesis Equation: Light energy & chlorophyll 6CO2 + 6H2O C6H12O6 + 6O2 Factors The resistance of a wire depends on certain factors. Some of these variables are listed below: * Light Wavelength * Carbon Dioxide (sodium hydrogen carbonated) * Temperature * Water All these factors will have to be kept constant except the concentration of sodium hydrogen carbonate to make sure that the investigation is a fair test. I have decided to investigate how the concentration of sodium hydrogen carbonate affects photosynthesis because other factors such as temperature and wavelength are hard to control or vary. I will weaken the concentration by half each time and will start at 5% and make my way down to 0.08 %. ...read more.

Middle

Risk Assessment and Safety Precautions There are not many safety precautions that need to be taken into consideration, in this experiment. The main two I can think of are stated below: * Do not get any chemicals on skin or in your mouth as this could be harmful * Make sure to keep any electrical wires from the lamp away from water, thus preventing an electrical shock Method * Collect the apparatus. * Measure 7cm of pond weed; make sure there is a clean cut for the oxygen to come out. * Put the pondweed in the boiling tube, when the boiling tube is in the rack. * Get the solution of 5% Sodium Hydrogen Carbonate (NaHCO3). Put this in the boiling tube * Put the lamp on and shine it at the boiling tube. ...read more.

Conclusion

This is because there is more Carbon Dioxide so the pondweed has more resources to use for photosynthesis. Evaluation I do not think that my investigation was very fair because all of the bubbles were different sizes. This made our results inaccurate because we could not measure how much Oxygen there was. The only anomalous result on my graph is the result for 5 % concentration, which is higher than all of the other results. I think this can be explained because the NaHCO3 is twice as big as the next result, which means it should be correct to stand out. My results support my prediction of the number of bubbles getting smaller as the concentration goes down. To further investigate, I could use more concentrations of NaHCO3 going even as high as 100%. ...read more.

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