Recall the mnemonic for redox reactions:
Loss Electrons → Oxidation → Reducing Agent
Gain Electrons → Reduction → Oxidizing Agent
This means the element that gains electrons/reduced is the oxidizing agent while the element that loses electrons/oxidized is the reducing agent.
Treatment of gold metal with BrF3 and KF produces Br2 and KAuF4, a salt of gold.
Identify the reducing agent in this reaction.
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