What are amphoteric substances ? Give one example.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Amphoteric Substances:**
Amphoteric substances are defined as substances that have the ability to act both as acids and bases. This means they can donate protons (H⁺ ions) in reactions with bases and accept protons in reactions with acids.

2. **Behavior of Amphoteric Substances:**
- When reacting with an acid, an amphoteric substance will behave as a base.
- Conversely, when reacting with a base, it will behave as an acid.
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