EBK EXPLORING CHEMICAL ANALYSIS
EBK EXPLORING CHEMICAL ANALYSIS
5th Edition
ISBN: 8220101443908
Author: Harris
Publisher: MAC HIGHER
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Chapter 22, Problem 22.8P

(a)

Interpretation Introduction

Interpretation:

Nominal mass of the molecular ion of caffeine has to be determined. Reason behind the use of mz197111 for the internal standard (C13H3)3caffeine has to be explained.

Concept Introduction:

An internal standard in mass spectrometry is a compound that is chemically similar to the analyte but naturally not present in the sample. It displays characteristic signals in the mass spectrum.

(b)

Interpretation Introduction

Interpretation:

Reason for isotopic variant of the analyte to be excellent internal standard has to be explained.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Isotopic composition of composition of mz 195 has to be written. Intensity ratio mz195194. 195/194 has to be calculated.

Concept Introduction:

An internal standard in mass spectrometry is a compound that is chemically similar to the analyte but naturally not present in the sample. It displays characteristic signals in the mass spectrum.

Intensity ratio of M+1M for the molecular formula CnHxNyOz is calculated by formula as follows:

    Intensity ratio=n×1.1%

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6. Consider the following exothermic reaction below. 2Cu2+(aq) +41 (aq)2Cul(s) + 12(aq) a. If Cul is added, there will be a shift left/shift right/no shift (circle one). b. If Cu2+ is added, there will be a shift left/shift right/no shift (circle one). c. If a solution of AgNO3 is added, there will be a shift left/shift right/no shift (circle one). d. If the solvent hexane (C6H14) is added, there will be a shift left/shift right/no shift (circle one). Hint: one of the reaction species is more soluble in hexane than in water. e. If the reaction is cooled, there will be a shift left/shift right/no shift (circle one). f. Which of the changes above will change the equilibrium constant, K?
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