When measuring iron in river water by spectrophotometry using the ferrozine reaction that isdescribed in the class notes, a student finds that they cannot distinguish their samples from noise(i.e. they are below the limit of detection) when they use a 1-cm cuvette. The student makes thedecision to use a 5-cm cuvette in their method instead.a) By how much should the student expect their sample measurements to increase by?Why?b) Will their reagent blank also increase by the same amount? Why or why not?3.

(a) In spectrophotometry, the absorbance is directly proportional to the concentration of analyte…

Answered: a) By how much should the student…

a) By how much should the student expect their sample measurements to increase by? Why? b) Will their reagent blank also increase by the same amount? Why or why not?

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

ChapterA: Scientific Notation And Experimental Error

Section: Chapter Questions

Problem 8P

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Question

When measuring iron in river water by spectrophotometry using the ferrozine reaction that is
described in the class notes, a student finds that they cannot distinguish their samples from noise
(i.e. they are below the limit of detection) when they use a 1-cm cuvette. The student makes the
decision to use a 5-cm cuvette in their method instead.
a) By how much should the student expect their sample measurements to increase by?
Why?
b) Will their reagent blank also increase by the same amount? Why or why not?
3.

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