Effie Lab 9 Light Inquiry

Effie Lab 9 Light Inquiry - Effie Kou November 16, 2009...

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November 16, 2009 Chem 1A Stacy/Kim Section 130 Experiment 9: Light Inquiry Abstract The goal is to understand light and how it affects transmittance and absorbance. The approach is to find the extinction coefficient of the four food dyes in order to determine which ones are used in the Kool-Aid. Beer’s Law is used to calculate the concentrations of the Kool- Aid. Then the transmission and absorbance curves of various filters are analyzed to determine how different colored lights and filters can change the color of how Kool-Aid looks. This lab illustrates that when a white light, a combination of all the colors of the spectrum, is shined through a certain color filter, that same color will be transmitted, while the other colors are absorbed and thus not visible. Introduction The transmittance of light is how intense a light passes through a sample. The absorbance of light is the level at which all the colors that are absorbed and are not shown, hence absorption. For instance, in a red filter, the transmission values of red and blue are high, but the transmission values of orange, yellow, and green are low. Conversely, the absorbance values of red and blue are low, but the absorbance values of orange, yellow, and green are high. In this experiment, the spectroscopy technique is used to determine the concentrations of the dyes found in the cherry and grape flavors of Kool-Aid. The data acquired will show the peaks, illustrating which colors are transmitted. This data reflects the absorbance values of the dyes. From these values, the extinction coefficient can be found as the slope of the Beer's plot. 1
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This note was uploaded on 05/04/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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Effie Lab 9 Light Inquiry - Effie Kou November 16, 2009...

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