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Chemistry
Chemistry
Problem
Table 3 shows some standard electrode potential data.
E
∘
/
V
E^\circ / \text{V}
E
∘
/
V
ZnO
(
s
)
+
H
2
O
(
l
)
+
2
e
−
⟶
Zn
(
s
)
+
2
OH
−
(
aq
)
\text{ZnO}(\text{s}) + \text{H}_2\text{O}(\text{l}) + 2\text{e}^- \longrightarrow \text{Zn}(\text{s}) + 2\text{OH}^-(\text{aq})
ZnO
(
s
)
+
H
2
O
(
l
)
+
2
e
−
⟶
Zn
(
s
)
+
2
OH
−
(
aq
)
-1.25
Fe
2
+
(
aq
)
+
2
e
−
⟶
Fe
(
s
)
\text{Fe}^{2+}(\text{aq}) + 2\text{e}^- \longrightarrow \text{Fe}(\text{s})
Fe
2
+
(
aq
)
+
2
e
−
⟶
Fe
(
s
)
-0.44
O
2
(
g
)
+
2
H
2
O
(
l
)
+
4
e
−
⟶
4
OH
−
(
aq
)
\text{O}_2(\text{g}) + 2\text{H}_2\text{O}(\text{l}) + 4\text{e}^- \longrightarrow 4\text{OH}^-(\text{aq})
O
2
(
g
)
+
2
H
2
O
(
l
)
+
4
e
−
⟶
4
OH
−
(
aq
)
+0.40
2
HOCl
(
aq
)
+
2
H
+
(
aq
)
+
2
e
−
⟶
Cl
2
(
g
)
+
2
H
2
O
(
l
)
2\text{HOCl}(\text{aq}) + 2\text{H}^+(\text{aq}) + 2\text{e}^- \longrightarrow \text{Cl}_2(\text{g}) + 2\text{H}_2\text{O}(\text{l})
2
HOCl
(
aq
)
+
2
H
+
(
aq
)
+
2
e
−
⟶
Cl
2
(
g
)
+
2
H
2
O
(
l
)
+1.64
a. Give the conventional representation of the cell that is used to measure the standard electrode potential of iron as shown in Table 3. b. With reference to electrons, give the meaning of the term
reducing agent
. c. Identify the weakest reducing agent from the species in Table 3. Explain how you deduced your answer. Species _____ Explanation _____
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