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 6, Problem 6.17QAP
Interpretation Introduction

(a)

Interpretation:

The percent transmittance 11.35% is to be converted into absorbance.

Concept introduction:

The percent of light passing through the sample can be reported in a transmittance. In order to calculate the percent transmittance, the transmittance is multiplied by 100.

Interpretation Introduction

(b)

Interpretation:

The percent transmittance 45.6% is to be converted into absorbance.

Concept introduction:

The percent of light passing through the sample can be reported in a transmittance. In order to calculate the percent transmittance, the transmittance is multiplied by 100.

Interpretation Introduction

(c)

Interpretation:

The percent transmittance 22.8% is to be converted into absorbance.

Concept introduction:

The percent of light passing through the sample can be reported in a transmittance. In order to calculate the percent transmittance, the transmittance is multiplied by 100.

Interpretation Introduction

(d)

Interpretation:

The percent transmittance 1.085% is to be converted into absorbance.

Concept introduction:

The percent of light passing through the sample can be reported in a transmittance. In order to calculate the percent transmittance, the transmittance is multiplied by 100.

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Why should absorbance be less than 2?  Please explain in terms of light transmittance
(d) The Beer-Lambert law states that the absorbance (A) of light by a solution in a cuvette is given by: 10 A = In == ECL where lo is the incident light intensity, is the transmitted light intensity, e is the molar absorptivity, c is the concentration of the solution, and L is the path length of the cuvette. (1) Light with a wavelength of 800 nm is passed through a cuvette containing a solution of Coumarin dye. After passing through the cuvette, the light intensity was reduced to 10% of its initial value. What is the absorbance of the solution of Coumarin dye? (ii) The concentration of the Coumarin dye is 0.004 mol dm3, and the cuvette has a path length of 1 cm. What is the molar absorptivity of Coumarin dye at 800 nm, in units of m² mot¹? (IT) The molar absorptivity of Coumarin dye at 400 nm is three times larger than at 800 nm. How would the absorbance of the solution change, when measured with 400 nm light rather than 800 nm light?
What is the absorbance of a solution if it had 79.5% transmittance?
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