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GCSE Chemistry · key term
A compound containing the carbonate ion, , which reacts with an acid to produce a salt, water and carbon dioxide.
Used by AQA and Edexcel
Specification 4.4.2.2 · Paper 1
Revise: Neutralisation and SaltsIn this topic, the bases include metal oxides, metal hydroxides and metal carbonates. An alkali is simply a base that dissolves in water: sodium hydroxide solution is an alkali, whereas copper oxide is an insoluble base.
Specification 3.11 · Paper 1
A compound containing a metal ion and carbonate ions, CO₃²⁻.
Revise: Reactions of AcidsA metal and a metal carbonate may both produce bubbles, but the gases are different: a metal produces hydrogen, while a carbonate produces carbon dioxide. Metal oxides and hydroxides produce water instead of a gas.
Identify the reactant before choosing the products: a metal gives hydrogen, whereas a metal carbonate gives carbon dioxide and water.
Do not describe an acid–metal reaction as neutralisation. Metal oxides and metal hydroxides act as bases, forming salt and water only; a metal carbonate also produces carbon dioxide, so it does not fit this course’s definition of a base.
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