... and I will keep the same light intensity. Method: I will collect a test tube and a clamp stand. I will put the test tube in the clamp stand then put the pond weed and the pond water in the test tube, then I will plug in my lamp and put it approximately 8 centimetres away from the test tube (this will stay the same for all trials). When my apparatus is set up correctly and safely I will first do a trial run, this will be to see if I need to change anything to improve my investigation. I will do 1 trial run and 2 main experiments. I will use no sodium bicarbonate for the first trial and go up by 1 teaspoonful of sodium bicarbonate each time until I reach 8. The sodium bicarbonate will add carbon dioxide to the water. Each trial will last 5 minutes. See ...

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