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Red Rain Experiment

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The goal of this experiment was to find the concentrations of caffeine in the energy drink purple rain. The research question for this experiment was, what is the concentrations of caffeine in purple drink? The hypothesis for this experiment was, the concentration of the caffeine in the purple rain will be.05 because it is the same concentration as the red 40. The data in the experiment supported the hypothesis, but was about .01 off. The concentrations of caffeine in the purple rain was found to be .041. This number was found by watering down a food dye that is found in the purple rain called red 40. Before doing this experiment its was found that the amount of caffeine in the purple rain was the same as the red 40. Also with the equipment …show more content…
One of the errors the could have affected the reliability of the data was in the standard curve the solutions with 4mL and 5 mL of red 40 were not included because the spectrophotometer was not able to measure the Absorbance values of the solutions because they were to high. This could of affect the y=mx+b formula, changing the final concentration of the caffeine in purple drink. Another, possible error was that the watered down solutions were not completely mixed. This could cause a higher concentration of red 40 or water to be in the section of the test tube that the light beam was shined through when it was placed in the spectrophotometer. If this was the case, this would change the point location of the standard curve and would change the y=mx+b formula, same as not including the two other solutions absorbances, overall changing the final calculation of the caffeine in the purple rain. Finally, an possible error that could of affected the solutions was the red 49 and purple rain was left out in the science lab and wasn't kept at a constant temperature making it possible for the solutions to evaporating causing the concentration to increase. This would throw all of the Absorbances measured by the spectrophotometer causing the standard curve to off. This ultimately would cause the concentration of purple rain that was discovered be completely off. All of these possible errors affect the validity of the final claim that the concentration of caffeine in the purple rain was

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