Cu⁺ (aq) is unstable in solution and undergoes
simultaneous oxidation and reduction according to the
reaction :
2Cu⁺ (aq) ⇋ Cu²⁺ (aq) + Cu(s) choose correct Eº for
given reaction if Eº Cu²⁺/Cu = 0.34 V and Eº Cu²⁺/Cu⁺ = 0.15
V
(a) –0.38 V (b) +0.49 V
(c) +0.38 V (d) –0.19 V
Answers
Answered by
1
Explanation:
ANSWER
From given data (from ΔG
o
=−nE
o
F)
(i)Cu(s)⟶Cu
2+
(aq)+2e
−
. ΔG
1
o
=−2×(−0.34)×F
(ii)Cu
2+
(aq)+e
−
⟶Cu
+
(aq). ΔG
2
o
=−1×(0.15)F
On adition
Cu(s)⟶Cu
+
(aq)+e
−
. ΔG
3
o
=−1×E
o
×E
ΔG
3
o
=ΔG
1
o
+ΔG
2
o
=(−2×−0.34×F)+(−1×0.15×F)
=+0.68F−0.15F−0.53F
or E
o
=−0.53V
Reaction,
$$2{Cu}^{+}(aq)\rightleftharpoons {Cu}^{2+}(aq)+Cu(s){E}^{o}=?$$
So, Cu
+
(aq)+e
−
⇌Cu(s), E
o
=+0.53V
$${Cu}^{+}(aq)\rightleftharpoons {Cu}^{2+}(aq)+{e}^{-}$$; E
o
=−0.15V
$$3{Cu}^{+}(aq)\rightleftharpoons {Cu}^{2+}(aq)+Cu(s)$$, E
o
=+0.38V
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