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b) A possible huge source of error for this experiment would be if the cuvettes were not always placed with the clear side facing the correct way. This would cause significantly less light to get through. A similar possible cause of error is if fingerprints or other dirt get on the cuvettes without being cleaned off. c) I am fairly confident in the concentration of the unknown. My r2value was above 0.99,so I feel it is accurate. d) The slope was 0.0019. It represents how much the absorbance changes for every 1ppm increase in the concentration. e) An easy solution would be to dilute the solution to a specific degree and then readjust the result after. For example, it could be diluted to a 1:10 concentration and then the resulting value could be multiplied by 10.