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,

$A=cl\epsilon$

Where,

$A$ = Absorbance

$c$ = Concentration of the solution

$l$ = Path length of the cell

$\epsilon$ = Absorptivity of the solution

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

$\sqrt{{\frac{\left(\Sigma x_i^2\right)-\frac{\left(\Sigma \text{x}\right)}{N}}{N-1}}^2}$