Consider a voltaic cell in which the following reaction occurs. Zn ( s ) + Sn 2 + ( a q ) → Zn 2 + ( a q ) + Sn ( s ) (a) Calculate E ° for the cell. (b) When the cell operates, what happens to the concentration of Zn 2 + ? The concentration of Sn 2 + ? (c) When the cell voltage drops to zero, what is the ratio of the concentration of Zn 2 + to that of Sn 2 + ? (d) If the concentration of both cations is 1.0 M originally, what are the concentrations when the voltage drops to zero?
Consider a voltaic cell in which the following reaction occurs. Zn ( s ) + Sn 2 + ( a q ) → Zn 2 + ( a q ) + Sn ( s ) (a) Calculate E ° for the cell. (b) When the cell operates, what happens to the concentration of Zn 2 + ? The concentration of Sn 2 + ? (c) When the cell voltage drops to zero, what is the ratio of the concentration of Zn 2 + to that of Sn 2 + ? (d) If the concentration of both cations is 1.0 M originally, what are the concentrations when the voltage drops to zero?
Solution Summary: The author explains that the standard voltage (E°) for a voltaic cell with the following redox reaction needs to be deduced.
Consider a voltaic cell in which the following reaction occurs.
Zn
(
s
)
+
Sn
2
+
(
a
q
)
→
Zn
2
+
(
a
q
)
+
Sn
(
s
)
(a) Calculate E° for the cell. (b) When the cell operates, what happens to the concentration of Zn2+? The concentration of Sn2+? (c) When the cell voltage drops to zero, what is the ratio of the concentration of Zn2+ to that of Sn2+? (d) If the concentration of both cations is 1.0 M originally, what are the concentrations when the voltage drops to zero?
4.
a) Give a suitable rationale for the following cyclization, stating the type of process involved
(e.g. 9-endo-dig), clearly showing the mechanistic details at each step.
H
CO₂Me
1) NaOMe
2) H3O®
CO₂Me
2. Platinum and other group 10 metals often act as solid phase hydrogenation catalysts for
unsaturated hydrocarbons such as propylene, CH3CHCH2. In order for the reaction to be
catalyzed the propylene molecules must first adsorb onto the surface. In order to completely
cover the surface of a piece of platinum that has an area of 1.50 cm² with propylene, a total
of 3.45 x 10¹7 molecules are needed. Determine the mass of the propylene molecules that
have been absorbed onto the platinum surface.
Chem 141, Dr. Haefner
2. (a) Many main group oxides form acidic solutions when added to water. For example solid
tetraphosphorous decaoxide reacts with water to produce phosphoric acid. Write a balanced
chemical equation for this reaction.
(b) Calcium phosphate reacts with silicon dioxide and carbon graphite at elevated temperatures
to produce white phosphorous (P4) as a gas along with calcium silicate (Silcate ion is SiO3²-)
and carbon monoxide. Write a balanced chemical equation for this reaction.
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