3 How did these values compare with mean values obtained from the DO probe The

# 3 how did these values compare with mean values

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3) How did these values compare with mean values obtained from the DO probe? The mean value for the DO probe is 6.23mg/L which have the same value as the class mean. Which means the titration has carried out in a correct and precise way. And it proves that titration ia a reliable way to calculate DO concentration. 4) What was the class average consumption of O2 in the pond water in the dark? What was the class average production of O2 in the light? How do you explain your results? The class average consumption of O2 in the pond water in the dark is 0.76mg/L. While the class average production of O2 in the light one is 0.59mg/L. The pond water in dark is solemnly undergoing respiration due to the lack of sunlight to trigger off photosynthesis. Therefore, only O2 is consumed and CO2 is produced in this bottle. While for the bottle in light, there are both photosynthesis and respiration carrying out. There is a net production of O2 since photosynthesis is more dominant in daytime. However, some O2 was consumed in the process of respiration. Thus, it results in a smaller amount of O2 left. 5) How much CO2 g -1 of Elodea was consumed and produced in the light and dark bottle, respectively? How do you explain these changes? The CO2 g -1 of Elodea was consumed in the light bottle is 0.000729 mg/L g hr. While the CO2 g -1 of Elodea was produced in the dark bottle is 0.002292 mg/L g hr.

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