Question

which wavelength of light is the best choice when attempting to quantitatively relate solution absorbance and concentration? question 8 options: the wavelength where the transmittance of the solution is largest. the wavelength where the absorbance of the solution is largest. the wavelength where the absorbance of the solution is smallest. any wavelength that matches the apparent color of the solution.

Answer 1

The wavelength where the absorbance of the solution is largest is the best choice.

Spectroscopy is based on Beer Lamberts law, where absorbance and transmittance are used to identify the quantity and quality of the sample. The quantitative analysis is utilised for concentration while qualitative analysis is used to identify the functional groups or chemical compounds and occurence or flow of reaction.

The large molar absorptivity is preferred as the minimum sample amount can provide measurable absorbance value. The same is evident from the absorption formula, where molar absorptivity and concentration are inversely proportional.

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