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Plants take in carbon dioxide and realise oxygen using photosynthesis so I am trying to determine the rate of photosynthesis. In this experiment I will investigate how sodium hydrogen carbonate affects the rate of photosynthesis.

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Introduction

Aim Plants take in carbon dioxide and realise oxygen using photosynthesis so I am trying to determine the rate of photosynthesis. In this experiment I will investigate how sodium hydrogen carbonate affects the rate of photosynthesis. Apparatus Needed * Glass Funnel * Desk lamp * 1 Litre Beaker * Test tube * Aquatic Plant (Canadian Pond weed) * A ball of plasticine * Sodium Hydrogen Carbonate * Razor Blade * Bench lamp with a 40W bulb * 30cm wooden ruler * Clock * Stirring rod Using the Apparatus * I will follow all the lab safety rules e.g. no running, no back packs etc) * I will have to keep the lamp away from making contact with any water or moisture. * When using the razor blade I must take extreme caution as it can easily cut my finger or cause harm to others. Fair Test To ensure that a fair test is carried out I will follow the following points promptly. ...read more.

Middle

Carbon dioxide is quiet important for Photosynthesis the formula below shows how is works:- So I think the two main factors in this experiment that effect the rate of photosynthesis are the amount of energy produced by the light and the amount of carbon dioxide available to the plant so when the carbon dioxide starts running out the amount of oxygen produced will start dropping so as the level of sodium hydrogen carbonate increases the amount of oxygen produced will increase. Method * I will fill a 1 litre beaker 3/4 full with water and dissolve a fixed concentration of sodium hydrogen carbonate in it, I will use the stirring rod to help dissolve the sodium hydrogen properly. For this experiment I will be using 4 different quantities of sodium hydrogen carbonate. One concentration per experiment. o Normal No Concentration o 0.0100 mol dm-3 o 0.0125 mol dm-3 o 0.0250 mol dm-3 o 0.0500 mol dm-3 * Using a razor blade I will cut five equal size portions from the Canadian Pond weed, each from the top end of a different shoot. ...read more.

Conclusion

The results I gathered were pretty much the expected results I believe one of the key features of the success of the results was the fresh Canadian pond weed I used as in the past I have heard numerous stories about other types of pond weed such as 'Elodea' not producing the rate of photosynthesis properly because the don't last fresh for long. I also calculated the average of the results and the answers were not very different, making the results even more reliable. But I had to keep in mind that there are a few variables that could have made my experiments results wrong or different such as the heat of the bulb increased as I left it on for longer, it is a common known fact that the increase in temperature could also affect the rate of photosynthesis but I believe even if it did affect the results they would not be much different then they the correct results. Biology Coursework BY Mohammed Umar ...read more.

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