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Chemistry
Chemistry
Problem
How do the products compare at each electrode when aqueous 1 mol dm
-3
magnesium bromide and molten magnesium bromide are electrolyzed?
E
⊖
/
V
E^\ominus / \text{V}
E
⊖
/
V
Mg
2
+
(
aq
)
+
2
e
−
⇌
Mg
(
s
)
\text{Mg}^{2+}(\text{aq}) + 2\text{e}^- \rightleftharpoons \text{Mg}(\text{s})
Mg
2
+
(
aq
)
+
2
e
−
⇌
Mg
(
s
)
-2.37
1
2
Br
2
(
l
)
+
e
−
⇌
Br
−
(
aq
)
\frac{1}{2}\text{Br}_2(\text{l}) + \text{e}^- \rightleftharpoons \text{Br}^-(\text{aq})
2
1
Br
2
(
l
)
+
e
−
⇌
Br
−
(
aq
)
+1.07
1
2
O
2
(
g
)
+
2
H
+
(
aq
)
+
2
e
−
⇌
H
2
O
(
l
)
\frac{1}{2}\text{O}_2(\text{g}) + 2\text{H}^+(\text{aq}) + 2\text{e}^- \rightleftharpoons \text{H}_2\text{O}(\text{l})
2
1
O
2
(
g
)
+
2
H
+
(
aq
)
+
2
e
−
⇌
H
2
O
(
l
)
+1.23
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