Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 13, Problem 13.22QAP
Interpretation Introduction

Interpretation:

Using the given values, absorbance and transmittance should be calculated. To derive the spectrum of the compound the graph between wavelength and absorbance should be constructed.

Concept introduction:

Diode array spectrophotometer is used for instrumental analysis. As it is composed with a single detector, the instrument is capable of monitoring one wavelength at a time. Diode array spectrophotometer is very fast in data acquisition, which allows building up multiple spectra for a single sample. The final spectrum is presented as an average of individual samples.

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A buffered solution containing dissolved aniline, CH,NH2, and aniline hydrochloride, CH, NH, Cl, has a pH of 5.41. Determine the concentration of CH, NH in the solution if the concentration of CH, NH, is 0.305 M. The pK of aniline is 9.13. [CHẠNH] = Calculate the change in pH of the solution, ApH, if 0.375 g NaOH is added to the buffer for a final volume of 1.40 L. Assume that any contribution of NaOH to the volume is negligible. ApH = M
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