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UV-Vis Spectroscopy (isopropanol, c=1.60*104 M) 331 nm, A= 1.03 500 nm, A= 0.18 15 Wavelength (nm) Absorbance

UV-Vis Spectroscopy (isopropanol, c=1.60*104 M) 331 nm, A= 1.03 500 nm, A= 0.18 15 Wavelength (nm) Absorbance

Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry
Section: Chapter Questions
Problem 9.2QAP
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Attatched is UV-Vis Spectrum (Isopropanol, c= 1.65 * 10-4 M)

Include the UV-Vis data in a table with wavelength, absorbance. and molar extinction coefficient 

Wavelength

Absorbance

Molar Extinction Coefficient

300-700 nm

 

 
UV-Vis Spectroscopy (isopropanol, c=1.60*104 M) JT JT* 331 nm, A= 1.03 JT* 500 nm, A= 0.18 n 15 Wavelength (nm) Absorbance
Transcribed Image Text:UV-Vis Spectroscopy (isopropanol, c=1.60*104 M) JT JT* 331 nm, A= 1.03 JT* 500 nm, A= 0.18 n 15 Wavelength (nm) Absorbance
Characterization V • UV-Vis Spectroscopy Range: =300-700 nm Solvent: isopropanol The compound is weakly polar and dissolving it in isopropanol is more difficult. So be PATIENT! • Concentration: based largest peak in the range to be measured: It is important that the entire sample is dissolve before any dilution in order to know the true concentration of the sample being measured in the end! • Cuvette: polyethylene • It can only be used with low boiling alcohols. Toluene, hexane, the solvent mixture used for recrystallization, acetone, etc. cannot be used with this cuvette because they will etch the cuvette making it non-transparent. 14
Transcribed Image Text:Characterization V • UV-Vis Spectroscopy Range: =300-700 nm Solvent: isopropanol The compound is weakly polar and dissolving it in isopropanol is more difficult. So be PATIENT! • Concentration: based largest peak in the range to be measured: It is important that the entire sample is dissolve before any dilution in order to know the true concentration of the sample being measured in the end! • Cuvette: polyethylene • It can only be used with low boiling alcohols. Toluene, hexane, the solvent mixture used for recrystallization, acetone, etc. cannot be used with this cuvette because they will etch the cuvette making it non-transparent. 14
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