(a) What is the molar absorptivity of compound Z at 295 nm and 348nm, given the absorption spectrum shown in Fig.22-14 (which was obtained using a UV-Vis spectrophotometer and a 1mM solution of compound Z in a sample cell with a path length of 1 cm)? (b) Now you have decided to make quantitative measurement of the level of compound Z in different solutions. Based on the above spectrum, which wavelength will you use for your measurements? Give two reasons why this is the optimum wavelength.

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter26: Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 26.23QAP
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  1. (a) What is the molar absorptivity of compound Z at 295 nm and 348nm, given the absorption spectrum shown in Fig.22-14 (which was obtained using a UV-Vis spectrophotometer and a 1mM solution of compound Z in a sample cell with a path length of 1 cm)?

(b) Now you have decided to make quantitative measurement of the level of compound Z in different solutions. Based on the above spectrum, which wavelength will you use for your measurements? Give two reasons why this is the optimum wavelength.

1.0
.9
.8-
.7-
.3
.2
.1-
280
300
320
340
360
380
400
Wavelength (nm)
22-14
figure
Absorption spectrum of compound Z, to be
used in conjunction with problems 4(a) and
4(b).
Absorbance (A)
4.
Transcribed Image Text:1.0 .9 .8- .7- .3 .2 .1- 280 300 320 340 360 380 400 Wavelength (nm) 22-14 figure Absorption spectrum of compound Z, to be used in conjunction with problems 4(a) and 4(b). Absorbance (A) 4.
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