Spectrophotometry of chromium salt

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Discussion Overview

The discussion centers on the choice of a 575 nm wavelength in the spectrophotometry of Potassium dioxalatodiaquochromate (III) dihydrate. Participants explore the reasoning behind this selection, considering both empirical data and theoretical concepts.

Discussion Character

  • Homework-related, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the reasoning behind the use of 575 nm, indicating a lack of discrete reasoning in available resources.
  • Another suggests searching for the full absorption spectrum to understand the choice of wavelength better.
  • A different participant notes that existing explanations focus on errors in absorption at various wavelengths and raises the idea of incorporating complementary colors into the reasoning.
  • One participant counters the complementary colors argument, stating that typically, the wavelength is chosen based on the highest absorption coefficient for sensitivity, and mentions the importance of considering interfering substances.

Areas of Agreement / Disagreement

Participants express differing views on the reasoning for selecting the 575 nm wavelength, with no consensus reached on the theoretical justification or the role of complementary colors in this context.

Contextual Notes

Participants highlight the potential limitations of existing explanations, including reliance on empirical data and the absence of a clear theoretical framework for wavelength selection.

aaku516
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Homework Statement


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


Homework Equations


none


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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