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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Please answer the question and provide a detailed drawing of the structure. If there will not be a new C – C bond, then the box under the drawing area will be checked.  Will the following reaction make a molecule with a new C – C bond as its major product:  Draw the major organic product or products, if the reaction will work. Be sure you use wedge and dash bonds if necessary, for example to distinguish between major products with different stereochemistry.
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