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VITEEE 2017 Solved Paper
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© examsnet.com
Question : 59
Total: 125
The standard reduction potential for
C
u
2
+
/ Cu is + 0.34. Calculate the reduction potential at pH = 14 for the above couple. (
K
s
p
C
u
(
O
H
)
2
= 1 ×
10
−
19
)
- 0.22 V
+ 0.22 V
- 0.44 V
+ 0.44 V
Validate
Solution:
When pH = 14
[
H
+
]
=
10
−
14
and
[
O
H
−
]
= 1 M
K
s
p
=
[
C
u
2
+
]
[
O
H
−
]
2
=
10
−
19
∴
[
C
u
2
+
]
=
10
−
19
[
O
H
−
]
2
=
10
−
19
The half cell reaction
C
u
2
+
+
2
e
−
→ Cu
E = E° -
0.059
2
log
1
[
C
u
2
+
]
= 0.34 -
0.059
2
log
1
10
−
19
= - 0.22 V
© examsnet.com
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