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stepan [7]
3 years ago
12

Why should the y-intercept of any Beer's Law Plot equal zero? Consider the experimental set-up and answer from a conceptual pers

pective
Chemistry
1 answer:
vovikov84 [41]3 years ago
5 0

Answer:

Answer has been given below.

Explanation:

  • According to Beer's law-    A=\epsilon .c.l
  • \epsilon represents molar absorptivity of a solution, c represents molarity of solution and l represents cell thickness.
  • Measurement of absorption is done by taking solutions of a particular solute with different concentrations. A particular solute has a particular maximum absorption wavelength. So absorption experiment is done by keeping this maximum absorption wavelength constant.
  • \epsilon remains constant for a particular solute and a particular    absorption wavelength.
  • During absorption experiment, same cuvette with a particular cell thickness is used. So "l" remains constant during experiment.
  • So the variables are "c" and "A" as absorption depends on concentration of solution.
  • Therefore Beer's law can be considered as  y=mx relation, where y is equivalent to "A" , x is equivalent to "c" and m is equivalent to "\epsilon .l".
  • Now, y=mx represents a straight line passing through origin. Therefore  y-intercept of any Beer's law plot equal to zero.
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