Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

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Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

Method

Firstly I will attach a capillary tube to the nozzle of end of a 20cm3 syringe by means of rubber tubing. I shall push the end of the capillary tube to the tip of the nozzle of the syringe, ensuring that the rubber tubing provides an airtight seal. Using razor blade I will cut three sections of the Elodea stem and after removing the plunger I shall place the cuttings into the nozzle. I will also make certain that the cut ends of the Elodea are facing upwards away from the nozzle end. After this is prepared I can then place the different concentrations of sodium hydrogen carbonate solutions into the barrel. The solutions that are to be used are 0.0100, 0.0125, 0.0166, 0.0250, 0.0500, 0.1000 mol dm-3. To do this I will place my finger over the open end of the capillary tube. Then slowly I will pour one of the concentrations of sodium hydrogen carbonate into the barrel. I will add the solution until the Elodea is covered to the 20cm3 marking. I will then invert the apparatus and slowly push the