Organic Chemistry: Principles and Mechanisms (Second Edition)
Organic Chemistry: Principles and Mechanisms (Second Edition)
2nd Edition
ISBN: 9780393663556
Author: Joel Karty
Publisher: W. W. Norton & Company
Question
Chapter 15, Problem 15.1P
Interpretation Introduction

Interpretation:

The percent transmittance and absorbance for the given sample are to be calculated from the given data.

Concept introduction:

UV–vis spectroscopy uses light from the UV and visible regions of the spectrum. These wavelengths range from 200800 nm.

At each wavelength, the intensity of light that reaches the detector (Idetected) is measured and compared with the initial intensity of light radiation from the source (Isource). At certain wavelengths, the sample (analyte) might interact with the light. The fraction of light may be transmitted, absorbed, and scattered through the sample. The fraction of transmitted light is detected by the detector in which case Idetected would be smaller than Isource. The percent transmittance (%T) is calculated according to the equation: %T = (Idetected/Isource) × 100.

The percent transmittance is converted to the corresponding absorbance by using the following equation:

A = - log(Idetected/Isource) = 2 - log(%T).

Expert Solution & Answer
Check Mark

Answer to Problem 15.1P

The calculated percent transmittance for the given sample is 25%.

The calculated absorbance for the given sample is 0.60.

Explanation of Solution

It is given that the intensity of the radiation from the source (Isource) is 1.0 × 10-4 W and the intensity of radiation exiting the sample (Idetected) is 2.5 × 10-5 W.

The percent transmittance (%T) is calculated according to the equation: %T = (Idetected/Isource) × 100.

Thus, by putting all given values we get

%T =  (Idetected/Isource) × 100       =  (2.5×10-5/1.0×10-4) × 100 %       = 25 %

Thus, the calculated percent transmittance for the given sample is 25%.

The percent transmittance is converted to the corresponding absorbance by using the following equation:

A = - log(Idetected/Isource    = 2 - log(%T)    = 2 - log(25)    = 2 - 1.39794    = 0.60

Thus, the calculated absorbance for the given sample is 0.60.

Conclusion

The percent transmittance and absorbance for the given sample are calculated from the given data by using corresponding equations.

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Chapter 15 Solutions

Organic Chemistry: Principles and Mechanisms (Second Edition)

Ch. 15 - Prob. 15.11PCh. 15 - Prob. 15.12PCh. 15 - Prob. 15.13PCh. 15 - Prob. 15.14PCh. 15 - Prob. 15.15PCh. 15 - Prob. 15.16PCh. 15 - Prob. 15.17PCh. 15 - Prob. 15.18PCh. 15 - Prob. 15.19PCh. 15 - Prob. 15.20PCh. 15 - Prob. 15.21PCh. 15 - Prob. 15.22PCh. 15 - Prob. 15.23PCh. 15 - Prob. 15.24PCh. 15 - Prob. 15.25PCh. 15 - Prob. 15.26PCh. 15 - Prob. 15.27PCh. 15 - Prob. 15.28PCh. 15 - Prob. 15.29PCh. 15 - Prob. 15.30PCh. 15 - Prob. 15.31PCh. 15 - Prob. 15.32PCh. 15 - Prob. 15.33PCh. 15 - Prob. 15.34PCh. 15 - Prob. 15.35PCh. 15 - Prob. 15.36PCh. 15 - Prob. 15.37PCh. 15 - Prob. 15.38PCh. 15 - Prob. 15.39PCh. 15 - Prob. 15.40PCh. 15 - Prob. 15.41PCh. 15 - Prob. 15.42PCh. 15 - Prob. 15.43PCh. 15 - Prob. 15.44PCh. 15 - Prob. 15.45PCh. 15 - Prob. 15.46PCh. 15 - Prob. 15.47PCh. 15 - Prob. 15.48PCh. 15 - Prob. 15.49PCh. 15 - Prob. 15.50PCh. 15 - Prob. 15.51PCh. 15 - Prob. 15.52PCh. 15 - Prob. 15.53PCh. 15 - Prob. 15.54PCh. 15 - Prob. 15.55PCh. 15 - Prob. 15.56PCh. 15 - Prob. 15.57PCh. 15 - Prob. 15.58PCh. 15 - Prob. 15.59PCh. 15 - Prob. 15.60PCh. 15 - Prob. 15.61PCh. 15 - Prob. 15.62PCh. 15 - Prob. 15.63PCh. 15 - Prob. 15.64PCh. 15 - Prob. 15.65PCh. 15 - Prob. 15.66PCh. 15 - Prob. 15.67PCh. 15 - Prob. 15.68PCh. 15 - Prob. 15.1YTCh. 15 - Prob. 15.2YTCh. 15 - Prob. 15.3YTCh. 15 - Prob. 15.4YTCh. 15 - Prob. 15.5YTCh. 15 - Prob. 15.6YTCh. 15 - Prob. 15.7YTCh. 15 - Prob. 15.8YTCh. 15 - Prob. 15.9YTCh. 15 - Prob. 15.10YTCh. 15 - Prob. 15.11YTCh. 15 - Prob. 15.12YTCh. 15 - Prob. 15.13YTCh. 15 - Prob. 15.14YTCh. 15 - Prob. 15.15YTCh. 15 - Prob. 15.16YTCh. 15 - Prob. 15.17YTCh. 15 - Prob. 15.18YTCh. 15 - Prob. 15.19YTCh. 15 - Prob. 15.20YTCh. 15 - Prob. 15.21YTCh. 15 - Prob. 15.22YTCh. 15 - Prob. 15.23YTCh. 15 - Prob. 15.24YTCh. 15 - Prob. 15.25YTCh. 15 - Prob. 15.26YTCh. 15 - Prob. 15.27YTCh. 15 - Prob. 15.28YTCh. 15 - Prob. 15.29YTCh. 15 - Prob. 15.30YT
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