2ClO3- + 5Hg+ 12H+5Hg2+ + Cl2+ 6H2O In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent?
Oxidation means loss of electrons. In oxidation, oxidation number of species increases.
Reduction means gain of electrons.In reduction, oxidation number of species decreases.
Oxidizing agent is a substance which itself undergoes reduction & oxidizes another substance
Reducing agent is a substance which itself undergoes oxidation & reduces another substance .
Consider reaction, 2 ClO3- + 5 Hg + 12 H+ 5 Hg2+ + Cl2+ 6 H2O
Element | oxidation number on reactant side | oxidation number on product side | Change in oxidation number | conclusion |
Cl | +5 | 0 | Decreased by 5 unit | Cl is reduced. |
O | -2 | -2 | No change | Neither oxidized nor reduced. |
Hg | 0 | +2 | Increased by 2 unit | Hg is oxidized. |
H | +1 | +1 | No change | Neither oxidized nor reduced. |
In above reaction, ClO3- acts as a Oxidizing agent and Hg acts as a reducing agent.
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