Figure 7 illustrates the transmittance spectra of two substances, I and II, whic

Question

Figure 7 illustrates the transmittance spectra of two substances, I and II, which do not react or interact in any way. (Remember, A = -log T.) 1. If you were to analyze an unknown mixture of I and II of approximately equal concentrations to those above, why would it be unwise to choose for your analysis lambda_1 and lambda_2?, lambda_1 and lambda_4?, lambda_2 and lambda_5? 2. If you were to analyze a solution of substance I in which a small quantity of substances II were present as an impurity, what wavelength(s) would you consider first in planning the analysis? Why? 3. Why is a two-component analysis possible by use of lambda_2 and lambda_A but not possible with lambda_A and lambda_B?

Explanation / Answer

A transmission spectrum will have its maximum intensities at wavelengths where the absorption is weakest .

Therefore substances mixed differently will have transmittance at different wavelength so it will be unfair to choose same wavelength which are opted for a certain set of substances.

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