As we can see, throughout the experiment, most of the variables, such as sunlight, size or temperature remained constant with NaHCO3 concentration being the only variable that changed.
NaHCO3 provides CO2 in the aquatic environment and therefore stimulates photosynthesis by increasing the average oxygen obtained in the 5 tests.
However, photosynthesis is no longer stimulated after reaching a concentration of 80 g/L NaHCO3.
Therefore, we can expect that at higher concentrations (120, 140, etc.) there is no significant change and therefore, the optimum NaHCO3 concentration would be 80 g/L NaHCO3.
