Discussion

         
           There could have been several sources of error in this experiment, among them, the use of different cuvettes, using the same pipette to remove some of the mixture from each cuvette, not pouring the correct amount of grape juice and water.  However, it is believed that the main source of error lay in the fact that we didn’t mix the solution completely.

            For example, in our first attempt, the 10/0 grape juice and water through 7/3 had inconsecutive numbers for %T and absorbance.  It is likely that the reading may have taken the measurement in areas that were not completely mixed.  We feel that this is the main source of error.  This is shown in the fact that in trial 2, we were careful to mix each cuvette with solution well.  This time, the readings came out with %T and absorbance consecutively.

            The usefulness of this lab in society is apparent.  Comparing graphs of the transmittance and absorbance of a certain ingredient that is isolated, and the graph of that ingredient in a product can verify the claims of juice companies.  Being able to check the claims of food companies ensures the fact that the public is getting exactly what they pay for.