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Bases and Alkalis

Metal oxides, hydroxides, carbonates are classified as bases.
Ammonia is also a base.
A base is a proton acceptor

A base neutralises an acid by accepting a proton from an acid to form a salt and water.
An alkali is a base that is dissolved in water to release hydroxide ions.

NaOH (s) + aq → Na+(aq) + OH-(aq)

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Specification: OCR Chemistry A (H032), AS-level, 2.1.4 Acids. Topic: Acids and Redox.

Key terms in this lesson

Ion
A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.
Acid
A proton donor; a substance that releases hydrogen ions when dissolved in water.
Salt
A compound formed when the hydrogen ions in an acid are replaced by metal ions or ammonium ions.

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