(a) Interpretation: The aborbance of the solution containing Fe ( SCN ) 2+ having the concentration of 4.47 × 10 − 5 M and the molar absorptivity of 7.00 × 10 3 L / mol ⋅ cm in a cell of path length 1.00 cm . Concept introduction: The absorbance of the solution is the ability of the solution to absorb the monochromatic light passing through it. The absorbance of the solution is defined as the ratio of the intensity of light incident on the solution to the intensity of light absorbed by the solution. The relation between the absorbance, path length, molar absorptivity and the concentration of the solution is given as. A = ε b c

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Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 13, Problem 13.8QAP
Interpretation Introduction

(a)

Interpretation:

The aborbance of the solution containing Fe(SCN)2+ having the concentration of 4.47×105M and the molar absorptivity of 7.00×103L/molcm in a cell of path length 1.00cm.

Concept introduction:

The absorbance of the solution is the ability of the solution to absorb the monochromatic light passing through it. The absorbance of the solution is defined as the ratio of the intensity of light incident on the solution to the intensity of light absorbed by the solution.

The relation between the absorbance, path length, molar absorptivity and the concentration of the solution is given as.

A=εbc

Interpretation Introduction

(b)

Interpretation:

The absorbance of the solution is to be calculated for the path length of the cell 2.50cm and the concentration being the half of the previous part.

Concept introduction:

The absorbance of the solution is the ability of the solution to absorb the monochromatic light passing through it. The absorbance of the solution is defined as the ratio of the intensity of light incident on the solution to the intensity of light absorbed by the solution.

The relation between the absorbance, path length, molar absorptivity and the concentration of the solution is given as.

A=εbc

Interpretation Introduction

(c)

Interpretation:

The percentage transmittance of the two solutions having different absorbance is to e calculated.

Concept introduction:

The percent transmittance of a solution is the ability of the solution to allow the monochromatic light to pass through it. The percent transmittance of a solution is the ratio of the intensity of monochromatic light incident on the solution to the intensity transmitted through the solution.

The relation between the absorbance and transmittance is established by the Beer’s law.

A=logT

Interpretation Introduction

(d)

Interpretation:

The absorbance of the solution that has half the transmittance as that of the solution in part (a) is to be calculated.

Concept introduction:

The absorbance of the solution is the ability of the solution to absorb the monochromatic light passing through it. The absorbance of the solution is defined as the ratio of the intensity of light incident on the solution to the intensity of light absorbed by the solution.

The absorbance of the solution is defined as the negative algorithm of the transmittance of the given solution.

A=log(T%100)

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