Identify the oxidising agent in the reaction2FeCl3+H2S→2FeCl2+S+2HCl
Question
Identify the oxidising agent in the reaction2FeCl3+H2S→2FeCl2+S+2HCl
Solution
In the given reaction 2FeCl3 + H2S → 2FeCl2 + S + 2HCl, the oxidising agent is the species that is reduced, i.e., its oxidation state decreases.
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Identify the oxidation states of the elements in the reactants and products.
In FeCl3, the oxidation state of Fe is +3. In H2S, the oxidation state of S is -2. In FeCl2, the oxidation state of Fe is +2. In S, the oxidation state of S is 0.
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Compare the oxidation states to determine which species is reduced and which is oxidised.
The oxidation state of Fe decreases from +3 in FeCl3 to +2 in FeCl2, so Fe is reduced. The oxidation state of S increases from -2 in H2S to 0 in S, so S is oxidised.
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Identify the oxidising agent.
The oxidising agent is the species that is reduced, so in this reaction, the oxidising agent is FeCl3.
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