The solution containing 6.4 ppm iron(III) after treating with excess of KSCN to form Fe ( SCN ) 2+ and it is diluted to 50 ml . The absorbance of the resulting solution should be determined. 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 initial and final concentration of the solution after dilution can be given by. M 1 V 1 = M 2 V 2 The relation between the absorbance, path length, molar absorptivity and the concentration of the complex solution is: A = ε b c

Question

A standard solution was put through appropriate dilutions to give the concentrations of iron shown in the table that follows. The iron(II)-1,10-phenanthroline complex was then formed in 25.0-mL aliquots of these solutions, following which each was diluted to 50.0 mL. The following absorbances (1.00-cm cells) were recorded at 510 nm: Calculate the concentration, in ppm, of a sample with an abosrbance of 0.829. Fe(II) concentration (ppm) A510 4.00 0.160 10.0 0.390 16.0 0.630 24.0 0.950 32.0 1.260 40.0 1.580

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Question

Chapter 13, Problem 13.9QAP

Interpretation Introduction

Interpretation:

The solution containing 6.4 ppm iron(III) after treating with excess of KSCN to form Fe(SCN)2+ and it is diluted to 50 ml. The absorbance of the resulting solution should be determined.

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 initial and final concentration of the solution after dilution can be given by.

M1V1=M2V2

The relation between the absorbance, path length, molar absorptivity and the concentration of the complex solution is:

A=εbc

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A standard solution was put through appropriate dilutions to give the concentrations of iron shown in the table that follows. The iron(II)-1,10-phenanthroline complex was then formed in 25.0-mL aliquots of these solutions, following which each was diluted to 50.0 mL. The following absorbances (1.00-cm cells) were recorded at 510 nm: Calculate the concentration, in ppm, of a sample with an abosrbance of 0.829. Fe(II) concentration (ppm) A510 4.00 0.160 10.0 0.390 16.0 0.630 24.0 0.950 32.0 1.260 40.0 1.580

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