Question

Which is true for spectroscopy of a mixture?

Answer 1

Absorbance of a mixture solution is additive. That mean the total absorbance at a perpendicular wavelength is the sum of the absorbance of its components at that wavelength.

This can be demonstrated through the sum of the absorbance in the solutions for which it is necessary to add to each specific absorbance its respective wavelength. Mathematically this is:

$A_{total,\lambda} = \sum\limit_i A_{i,\lambda}$

$A_{total,\lambda} = A_{1,\lambda}+A_{2,\lambda}+A_{3,\lambda}+...$

Therefore the correct option is A.