1. oxidation reduction reactions a. the zn-cu system oxidation half equation: re
ID: 520234 • Letter: 1
Question
1. oxidation reduction reactions
a. the zn-cu system
oxidation half equation:
reduction half equation:
net equation:
prediction of spontaneity:
comparison of predicted spontaneity with: experimental observations:
e° oxid:
e° red:
e° net:
b. the pb-cu system
oxidation half equation:
reduction half equation:
net equation:
prediction of spontaneity:
comparison of predicted spontaneity with: experimental observations:
e° oxid:
e° red:
e° net:
c. the zn-pb system
oxidation half equation:
reduction half equation:
net equation:
prediction of spontaneity:
comparison of predicted spontaneity with: experimental observations:
e° oxid:
e° red:
e° net:
please help
Explanation / Answer
(a)
The zn-cu system
oxidation half equation: Zn (s) -----------> Zn2+ (aq.) + 2 e
reduction half equation: Cu2+ (aq.) + 2 e -----------> Cu (s)
net equation: Zn (s) + Cu2+ (aq.) -----------> Zn2+ (aq.) + Cu (s)
prediction of spontaneity: Spontaneous as written in the forward direction
comparison of predicted spontaneity with: Spontaneous as written in the forward direction
e° oxid: = + 0.762 V
e° red: = + 0.342 V
e° net: = + 1.104 V
(b)
the pb-cu system
oxidation half equation: Pb (s) ----------> Pb2+ (aq.) + 2 e
reduction half equation: Cu2+ (aq.) + 2 e ----------> Cu (s)
net equation: Pb (s) + Cu2+ (aq.) -----------> Pb2+ (aq.)+ Cu (s)
prediction of spontaneity: Spontanoeus as writen in forward dierection.
comparison of predicted spontaneity with: Spontanoeus as writen in forward dierection.
e° oxid: = + 0.126 V
e° red: = + 0.342 V
e° net: = + 468 V
(c)
the zn-pb system
oxidation half equation: Zn (s) -------------> Zn2+ (aq.) + 2 e
reduction half equation: Pb2+ (aq.) + 2 e -----------> Pb (s)
net equation: Zn (s) + Pb2+ (aq.) ------------> Zn2+ (aq.) + Pb (s)
prediction of spontaneity: Spontaneous as written in the forward direction
comparison of predicted spontaneity with: Spontaneous as written in the forward direction
e° oxid: + 0.762 V
e° red: - 0.126 V
e° net: + 636 V
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