Exploring Chemical Analysis
Exploring Chemical Analysis
5th Edition
ISBN: 9781429275033
Author: Daniel C. Harris
Publisher: Macmillan Higher Education
Question
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Chapter 18, Problem 18.21P

(a)

Interpretation Introduction

Interpretation:

Molar absorptivity of compound A at 238 nm has to be calculated.

Concept Introduction:

Molar absorptivity is a coefficient that appears in Beer’s. It measures the extent of light absorbed at a certain wavelength. Molar absorptivity is denoted by the symbol ε. SI unit for molar absorptivity is M1cm1.

Expression to compute absorbance as per Beer’s law is as follows:

  A=εbc

Here,

ε denotes molar absorptivity of species capable to absorb in M1cm1.

b denotes path length in centimeters.

c denotes concentration or molarity of species capable to absorb.

A denotes absorbance.

T denotes transmittance.

(b)

Interpretation Introduction

Interpretation:

Beer's law has to be used to determine concentration of unknown solution of compound A.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Concentration of A in 25 mL sample solution has to be calculated.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

Concentration of A in 2 mL solution has to be calculated.

Concept Introduction:

Refer to part (a).

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