Discussion The lab began with the calculation of the percent transmittance and absorbance of the colored dyes and KMnO4 through the use of the spec 20. The results showed the relation between the percent transmittance and absorbance and the wavelength the data was taken at. This is because certain colors in the visible spectrum absorb different colors of light. The object appears to be red when all of the colors of the visible spectrum are absorbed besides red. Red on the other hand is reflected from the object and seen by the human eye. Thus, the object itself is not red it rather reflects red. After all the graphs and data were collected, this information was used to decide the approximate wavelength in which to use in further experiments. 550 nm was decided to be around the correct wavelength to conduct the experiment through the use of Figure 6. The wavelength of 550 nm was chosen because it was the peak wavelength on the absorbance graph. This peak is the ideal choice for choosing the analytical wavelength because it provides the most
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