Spectrophotometry of chromium salt

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The discussion centers on the choice of 575 nm wavelength for spectrophotometry of Potassium dioxalatodiaquochromate (III) dihydrate. It highlights the importance of selecting wavelengths based on the absorption spectrum, with a focus on maximizing sensitivity through high absorption coefficients. The concept of complementary colors is questioned in relation to wavelength selection, suggesting a need for theoretical reasoning behind this choice. The conversation also touches on the challenges posed by interfering substances and the need for careful wavelength selection to differentiate between the target compound and impurities. Overall, understanding the absorption characteristics of the compound is crucial for effective spectrophotometric analysis.
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Homework Statement


Why is 575 nm wavelength used in spectrophotometry of Potassium dioxalatodiaquochromate (III) dihydrate?


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The Attempt at a Solution


Cannot find discrete reasoning!
 
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I would start searching for the full absorption spectrum.
 
Yes I did search for it and found a page --> http://science.herograw.net/chem333l/CHEM333L-UV_Vis.pdf . But their reasoning is purely based on errors on absorption that were determined when using a variety of wavelengths. But I was wondering if there was a theoretical reason somehow including the concept complementary colors?
 
I have never heard about using complementary colors for the wavelength selection. If you have a single substance you will usually select wavelength for which the absorption coefficient is the highest, as this gives the best sensitivity. If there are interfering substances, you will select wavelengths for which differences in absorption coefficients between your substance and the impurities are the highest.
 
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