An aqueous solution of magnesium nitrate
is electrolyzed. What are the
gaseous products at the anode and cathode?
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Reaction in solution;
AgNO
3
→Ag
+
+NO
3
−
H
2
O→H
+
+OH
−
Reaction at cathode;
Ag
+
+e
−
→Ag
Reaction at anode;
Ag(s)+NO
3
−
→AgNO
3
(aq)+e
−
In aqueous solution, silver nitrate ionizes to silver ions and nitrate ions.
At cathode, either silver ions or water molecules can be reduced.
Since, silver ion has higher reduction potential than water, silver ions are reduced at cathode.
Similarly, at anode, either silver metal of water molecules can be oxidized. Since oxidation potential of silver is higher than that of water molecules, silver is oxidized.
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