Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Ed88 on July 17, 2019, 07:24:08 PM
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I am having trouble finding absorbance. I know how to calculate it using beers' law when i have a wavelength. I am given a table of potential mV vs Time. I was told to use -log( I/Io) intensity / average in intensity. I don't know how to calculate that from the data given. I tried finding the average of mV then and using that as Io but when I plug it in origin, the data is incorrect. I was given an example on how to it should look. I tried all different kind of ways to solve for Intensity but still can figure out. Thanks in advance.
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Io is the intensity of the light source without any absorbing species in the beam path. I is the intensity of the light source when the absorbing species are in the beam path. Io should always be greater than I (because absorbance reduces the light intensity.) You haven't provided a whole lot of detail about what you're doing, but if I'm reading between the lines correctly, Io should be your initial voltage measured before you've done any chemistry.
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Thanks for responding, I figured out what I did wrong. The experiment is flash photolysis and I was suppose to take the average from the lowest potential voltage until it reach to normal and use that as my initial intensity for the other trials. I was panicking because my lab is due tomorrow and there is really no one around to ask for help because it's the summer session. That's why I didn't explain myself very clearly.