Exploring Chemical Analysis
5th Edition
ISBN: 9781429275033
Author: Daniel C. Harris
Publisher: Macmillan Higher Education
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Question
Chapter 16, Problem 16.8P
Interpretation Introduction
Interpretation:
An indicator that would be suitable to find two end point has to be written.
Concept Introduction:
Titration is an analytical method of quantitative chemical analysis to determine concentration of analyte. A reagent known as titrant is prepared as standard solution of known concentration and volume.
A redox indicator is a chemical species that undergoes sharp color change at a specific electrode potential. Mostly redox indicators are organic compounds.
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1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
Potential Energy (kJ)
600
400
200
0
-200-
-400
-600-
-800
(i) Cl₂ (g) + Pt(s) → 2Cl (g) + Pt(s)
(ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s)
Ea = 1550 kJ
Ea = 2240 kJ
(iii) Cl (g) + CICO (g) → Cl₂CO (g)
Ea
= 2350 kJ
AH=-950 kJ
ΔΗ = 575 ΚΙ
AH=-825 kJ
a. Draw the potential energy diagram for the reaction. Label the data points for clarity.
The potential energy of the reactants is 600 kJ
Reaction Progress
b. What is the overall chemical equation?
c. What is the overall change in enthalpy for the above chemical reaction?
d. What is the overall amount of activation energy for the above chemical reaction?
e. Which reaction intermediate would be considered a catalyst (if any) and why?
f. If you were to add 2700kJ of energy to the reaction (e.g. 2700 kl of heat or electricity), would
you be able to make the reaction reverse itself (i.e. have…
draw the enolate anion and the carbonyl that would be needed to make this product through an aldol addition reaction.
Draw the Michael Adduct and the final product of the Robinson annulation reaction. Ignore inorganic byproducts.
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