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Essay text:
Just 2g of sodium bicarbonate in 1000ml of water gives the equivalent salinity of seawater, and as Elodea is a fresh water plant, it cannot survive in salt water. I will need to take this into account when measuring the NaHCO3.
To work out the rate of photosynthesis I am going to count how many bubbles of O2 are given off in a minute.
Prediction
I think that the more NaHCO3 there is in the solution, up to a certain point, the greater the number of O2 bubbles given off, showing a faster rate of photosynthesis.
Fair testing
To keep this experiment as fair as possible, the only variable I will change is the amount of NaHCO3 in the water...
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Common topics in this essay:
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