1)
The pH was monitored during this experiment to show the change in carbon dioxide concentration . Carbon dioxide is an acid, so it uses it, it produces oxygen, the pH of the water will thus increases (because it becomes less acidic).
2)
-The independent variable is temperature
-dependent variable is the pH.
3)
-Time should go on the x-asis
-pH should go on the y-axis.
4)
The optimum temperature for photosynthesis in the green alga Chlorella is the temperature at which the change in pH is the greatest. Therefore, the optimum temperature is around 25.0˚C because the change in pH was greatest.
However, when taking the ±0.05 uncertainty into consideration, the actual optimum temperature could be different. In conclusion, the temperature is around 25.0˚C.
5)
Different alga has different optimum temperature for photosynthesis as they are different.
6)
The experiment controls the initial CO2 concentration and the temperature, which is good, however, the experiment doesn’t control the light intensity and the concentration of the alga which could affect the pH. Therefore, a certain light intensity and a certain alga concentration should be the same for all trials.
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