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How does the amount of Light affect the amount of oxygen bubbles produced in sodium carbonate solution?

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How does the amount of Light affect the amount of oxygen bubbles produced in sodium carbonate solution? Aim In this investigation is to see is to see if when there is more light shining onto some pondweed in sodium carbonate solution it affects the amount of bubbles produced from the pondweed. Background information Photosynthesis is a chemical reaction occurring in the leaves of green plants. Using the energy from sunlight, it changes carbon dioxide and water into glucose and oxygen. Certain things will limit photosynthesis from photosynthesising quickly. One of these things is light. A plant can have lots of carbon dioxide and water but if it doesn't have enough light it won't work. Equation for Photosynthesis Carbon Dioxide + Water + Light Energy ==> Glucose + Oxygen Balanced Equation for Photosynthesis 6CO2+ 6H20 + Light energy ==> (chlorophyll) ...read more.


3) Turn the light on for one minute and count the amount of bubbles that are given off from pondweed. Repeat this three times using the same light, same distance, same position and same pondweed. Record all the results and work out the average. This gives a correct view of the results and so I can see if the is a wrong result. 4) Repeat step three at the distance on 10cm, 20cm, 30cm and 40cm making sure that the position, pondweed and light all stay exactly the same. The variables are the amount of light intensity, the amount of carbon dioxide and the amount of water. Diagram Table of Results Distance (cm) number of bubbles of oxygen (per minute) 1 2 3 Average 50 5 5 5 5 40 7 5 7 6.33 30 8 8 7 7.66 20 0 11 10 10 10 13 14 15 ...read more.


These anomalous results could have happened because we may have missed some oxygen bubbles. There is one way in which we could have done our experiment differently. We didn't use a heat shield and the results we got could have been affected by the heat changing. I think my method was suitable I think it proved my hypothesis well. I think to make my results more accurate I could have made sure the light was in the same position each time because it changed slightly each time we moved it. Also I could have moved the light right away from the pondweed e.g. 100cm away from eh pondweed to see if the pattern carries on. Also to get more varied results I could have tried a different amount of time in which to count the bubbles e.g. 2 minutes. But over all I think I got pretty accurate results, which still showed the pattern that happens when, photosynthesis occurs. ...read more.

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