The calibration curve between absorbance and concentration of standard series should be plotted. Using the regression line & the plot the concentration of the unknown solution should be calculated. The accuracy of these 2 methods should be compared by considering the final answers.Error analysis of the data should be done. Concept introduction: The absorbance of light can be determined by the Beer-Lambert law. The chemical equation relevant to the law is, A = c l ε Where, A = Absorbance c = Concentration of the solution l = Path length of the cell ε = Absorptivity of the solution Standard deviation of a data series can be calculated by the following equation. ( Σ i = 1 N x i 2 ) − ( Σ i = 1 N x ) N N − 1 2

BuyFind

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 13.26QAP
Interpretation Introduction

Interpretation:

The calibration curve between absorbance and concentration of standard series should be plotted. Using the regression line & the plot the concentration of the unknown solution should be calculated. The accuracy of these 2 methods should be compared by considering the final answers.Error analysis of the data should be done.

Concept introduction:

The absorbance of light can be determined by the Beer-Lambert law. The chemical equation relevant to the law is,

A=clε

Where,

A = Absorbance

c = Concentration of the solution

l = Path length of the cell

ε = Absorptivity of the solution

Standard deviation of a data series can be calculated by the following equation.

(Σi=1Nxi2)(Σi=1Nx)NN12

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