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 14, Problem 14.1QAP
Interpretation Introduction

Interpretation:

The concentration of the quinine present in the sample to be calculated.

Concept introduction:

The absorbance of a solution is basically it’s ability to absorb the intensity of the light incident.

The change in the concentration of the solution brings about the change in the absorbance of the solution.

The change in the concentration required for the particular change in absorbance is given by:

  cx=A1csVs(A2A1)Vx

Expert Solution & Answer
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Answer to Problem 14.1QAP

The concentration of the quinine solution is 22.0ppm .

Explanation of Solution

The expression for the concentration of the quinine is:

  cx=A1csVs(A2A1)Vx ..... (1)

Where,

  • cx is the unknown concentration of quinine.
  • cs is the known concentration of the solution.
  • A1 is the absorbance of the quinine solution for unknown concentration.
  • A2 is the absorbance of the quinine solution for known concentration.
  • Vx is the volume of the unknown solution.
  • Vs is the variable volume of solution.

The value of A1 is 0.636 .

The value of cs is 23.1ppm .

The value of Vs is 10.0ml .

The value of A2 is 0.903 .

The value of Vx is 25.0ml .

Substitute the values in equation (1).

  cx=A1csVs( A 2 A 1 )Vxcx=( 0.636)( 23.1ppm)( 10.0ml)( 0.9030.636)( 25.0ml)=146.9166.675ppm22.0ppm

The concentration of the quinine solution is 22.0ppm .

Conclusion

Thus, the concentration of the quinine solution is 22.0ppm .

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Tonic water (20.0 mL) was added into each of two volumetric flasks (100 mL). The first flask was made up to volume with deionised water and produced an absorbance of 0.200. To the second flask was added an aliquot (20.0 mL) of a quinine standard solution (20.0 ppm) and after being made up to volume this produced an absorbance of 0.400. What is the concentration of quinine in the tonic water? a. 8.00 ppm b. 800 ppm С. 40.0 ppm d. 400 ppm е. 20.0 ppm
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