Answered: 0.122 mg of Crystal Violet you…

0.122 mg of Crystal Violet you synthesized was dissolved in 100 ml of solvent. The absorbance was found to be 0.209, what is the purity of the Crystal Violet you synthesized?

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions

Section4.8: Stoichiometry Of Reactions In Aqueous Solution-titrations

Problem 2RC

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Concept explainers

Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.

Question

0.122 mg of Crystal Violet you synthesized was dissolved in 100 ml of solvent. The absorbance was found to be 0.209, what is the purity of the Crystal Violet you synthesized?

Expert Solution

Step 1

The expression of the absorbance is shown below:

$A = \log \frac{I_{0}}{I}$

where;

A = absorbance

I₀ = initial intensity

I = transmitted intensity

Step 2

The calculation of percentage of transmitted light is shown below:

$\begin{array}{rcl} \log \frac{I_{0}}{I} & = & 0.209 \\ \frac{I_{0}}{I} & = & 1.618 \\ \frac{I}{I_{0}} & = & 0.618 \\ I & = & 61.8 % I_{0} \end{array}$

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Analyzing and Predicting Spectroscopic Data

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