Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
Question
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Chapter 18, Problem 18.BE

(a)

Interpretation Introduction

Interpretation:

For the given compound A, the value of molar absorptivity has to be calculated.

Concept introduction:

Beer-lambert law:

A=-logPPo=εcbwhere,A-absorbancePo-incidentirradianceandP-transmittedirradianceε-molarabsorptivityc-concentrationandb-pathlength.

(a)

Expert Solution
Check Mark

Answer to Problem 18.BE

The molar absorptivity (ε) value of compound A is 1.50×103M-1cm-1.

Explanation of Solution

Given information,

Concentrationis3.96×10-4M.Absorbance(A)is0.624at238nmin1.000cmcuvet.Absorbanceforblanksolutionis0.029at238nm.

Apply the Beer’s law to calculate the value of molar absorptivity (ε)

A=εcbε=Abc=0.624-0.029(3.96×10-4M-1cm-1)(1.000cm)=1.50×103M-1cm-1.

The molar absorptivity (ε) value of compound A is 1.50×103M-1cm-1.

(b)

Interpretation Introduction

Interpretation:

The concentration of compound A in the unknown solution has to be calculated.

Concept introduction:

Beer-lambert law:

A=-logPPo=εcbwhere,A-absorbancePo-incidentirradianceandP-transmittedirradianceε-molarabsorptivityc-concentrationandb-pathlength.

(b)

Expert Solution
Check Mark

Answer to Problem 18.BE

The concentration of compound A in the unknown solution is 2.31×10-4M.

Explanation of Solution

Given information,

Absorbance(A)is0.375at238nmin1.000cmcuvet.Absorbanceforblanksolutionis0.029at238nm.Molarabsorptivityis1.50×103M-1cm-1.

Calculate the concentration of compound A in the unknown solution

c=Aεb=0.375-0.029(1.50×103M-1cm-1)(1.000cm)=2.31×10-4M.

The concentration of compound A in the unknown solution is 2.31×10-4M.

(c)

Interpretation Introduction

Interpretation:

The concentration of compound A in the concentrated solution has to be calculated.

Concept introduction:

Beer-lambert law:

A=-logPPo=εcbwhere,A-absorbancePo-incidentirradianceandP-transmittedirradianceε-molarabsorptivityc-concentrationandb-pathlength.

(c)

Expert Solution
Check Mark

Answer to Problem 18.BE

The concentration of compound A in the concentrated solution is 5.87×10-3M.

Explanation of Solution

Given information,

Initialvolumeis2.00mL,Finalvolumeis25.00mL.Absorbance(A)is0.733at238nmin1.000cmcuvet.Absorbanceforblanksolutionis0.029.Molarabsorptivityis1.50×103M-1cm-1.

Calculate the concentration of compound A in the concentrated solution

c=(dilutionfactor)Aεb=(25.00mL2.00mL)0.733-0.029(1.50×103M-1cm-1)(1.000cm)=5.87×10-3M.

The concentration of compound A in the concentrated solution is 5.87×10-3M.

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