This video tutorial shows you how to identify the oxidizing and reducing agent in a redox reaction. The first step in determining which species is the oxidizing agent is to start by finding which reactant was reduced. Likewise, the molecule or element that is was oxidized is also the reducing agent. That's how you can determine it. However, you need to calculate the oxidation numbers or states for every element in the chemical equation. Oxidation involves a loss of electrons and occurs when the oxidation number increases. Reduction involves a gain of electrons and occurs when the oxidation state decreases.

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