Respuesta :
Answer:
Answer has been given below.
Explanation:
- According to Beer's law- [tex]A=\epsilon .c.l[/tex]
- [tex]\epsilon[/tex] 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.
- [tex]\epsilon[/tex] 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 "[tex]\epsilon .l[/tex]".
- Now, y=mx represents a straight line passing through origin. Therefore y-intercept of any Beer's law plot equal to zero.
When measuring the absorbance of the blank where the concentration of the solute is zero, the y- intercept of the Beer Lambert plot is zero.
What is the Beer Lamberts's law?
The Beer Lamberts law measures the absorbance in solution as a function of concentration when the path length is held constant. Recall that procedure begins by measuring the absorbance of the bank.
We have to note that when measuring the absorbance of the blank where the concentration of the solute is zero, the y- intercept of the Beer Lambert plot is zero.
Learn more about Beer Lambert plot:https://brainly.com/question/1190311
