What is a reducing agent?

A reducing agent, also known as a reductant or reducer, is an element or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction. Since the reducing agent is losing electrons, it is said to be oxidized.

Here are the steps to understand it:

1. Understand Redox Reactions: Redox reactions are a family of reactions that are concerned with the transfer of electrons between species. The term 'redox' is a portmanteau of the words 'reduction' and 'oxidation'.

2. Understand Oxidation: Oxidation is the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation state of a molecule, atom or ion is increased.

3. Understand Reduction: Reduction is the gain of electrons during a reaction by a molecule, atom or ion. Reduction occurs when the oxidation state of a molecule, atom or ion is decreased.

4. Role of Reducing Agent: The reducing agent, in a redox reaction, donates its own electrons to another substance. This causes the substance to be reduced, while the reducing agent is oxidized.

5. Example: A classic example of a reducing agent is hydrogen, which donates its electron to form a bond, thereby reducing the other substance.

So, in summary, a reducing agent is a substance that reduces another substance in a redox chemical reaction by donating its own electrons.