Project 13- Analysis of Colas

This outcome was probably unplanned for and should

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Unformatted text preview: eeper color and therefore allowing more of the solution to be absorbed when light is being entered through the solution. When measuring the KH2PO4, more of the solution was absorbed at lower wavelengths and more of the solution was transmitted at higher wavelengths. This could relate to the solution’s color. The color absorbed was closer to the left side of the color spectrum and therefore probably does not transmit as much as energy as the blue solution indicated earlier in the experiment. Since more of the solution was absorbed at a lower wavelength then more of the light absorbed was high energy. Also, the most absorbed part of the solution was when the solution can be visualized best and its complementary color/ solution is found at that wavelength for the most transmittance. After calibrating the curve for molarity vs. absorbance of KH2PO4, to determine phosphate concentration, it was easy to determine the concentration of phosphate. The phosphate content in the three colas were all different from one another Dr Pepper being the highest and Sam’s being last with a negative absorbance. Since Dr Pepper is made by a bigger company and manufactured to more people, maybe the phosphate content has something to do with its popularity and taste. But since the Sam’s Cola had a negative absorbance, does this make us assume that there is no phosphate content in that particular Cola? This outcome was probably unplanned for and should probably be rested without bias and being particularly careful with the solutions. Problems encountered through this experiment are the negative absorbance of the Sam’s Cola. Any number of things could have occurred to produce a negative absorbance, but one in particular should be looked at. When diluting the colas, extra care should be taken to do this as accurately as possible to ensure precise and accurate measurements. Several other errors that could have occurred is the Spec 20 not being correctly calibrated and therefore it producing skewed results and wrong percent transmittance. Other problems encountered with the solutions were exact measurements with the solutions. After water or solution has been extracted not all of it will enter the beaker or the cuvette, and therefore will not provide as accurate results as possible. Conclusion The goals of the lab were accomplished as well as the overall goal, finding the phosphate content of colas. The correlation between color and the absorbance was determined along with the relationship between concentration and rate of absorbance. Also, Beer’s Law was supported (literature introduced in the beginning). It can be determined that...
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This note was uploaded on 06/25/2013 for the course CH 101 taught by Professor Taylor during the Fall '08 term at Clemson.

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