Redox And Electrochemistry Worksheet With Answer Key Page 7
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8#5 Answer:
–
(a) Cl
is more easily oxidized than water
+
water is more easily reduced than Na
farad
2+
→ 1
(b) Fe
req. 2
Fe
or 1 farad
/
mol Fe
(s)
(s)
2
mol
farad
3+
→ 1
Fe
req. 3
Fe
or 1 farad
/
mol Fe
(s)
(s)
3
mol
for equal numbers of farad 1/2:1/3 :: 1.5:1
(c) using LeChatelier’s principle
] ↓ , reaction shifts → , ∴ cell potential ↑
2+
if [Zn
] ↓ , reaction shifts ← , ∴ cell potential ↓
2+
if [Pb
or using the Nernst Equation
2+
2+
E
= E˚ - RT lnQ, where Q = [Zn
]/[Pb
],
cell
] ↓ , Q<1, E
2+
if [Zn
> E˚
cell
] ↓ , Q>1, E
2+
if [Pb
< E˚
cell
] does not change regardless of the values, ∴ E
2+
2+
(d) [Zn
]/[Pb
= E˚
cell
2+
2+
or [Zn
]/[Pb
] = 1; ln Q = 0; E
= E˚
cell
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