Amphoteric
Definition
An amphoteric substance can act as both an acid and a base. This dual behavior depends on the chemical environment it encounters.
5 Must Know Facts For Your Next Test
- Water is a common example of an amphoteric substance.
- Amphoteric behavior is explained by the Brønsted-Lowry theory, where substances can either donate or accept protons.
- Aluminum hydroxide (Al(OH)3) and zinc oxide (ZnO) are examples of amphoteric compounds.
- Amphoteric substances can neutralize both acids and bases, forming salts and water in the process.
- The pH at which an amphoteric molecule has no net charge is called its isoelectric point.
Review Questions
- What does it mean for a substance to be amphoteric?
- Give two examples of amphoteric substances besides water.
- How does Brønsted-Lowry theory explain the behavior of amphoteric substances?
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Related terms
Brønsted-Lowry Acid: A substance that donates a proton (H\(^+\)) in a chemical reaction.
Brønsted-Lowry Base: A substance that accepts a proton (H\(^+\)) in a chemical reaction.
Isoelectric Point: The pH at which an amphoteric molecule has no net electrical charge.
