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GCSE Chemistry · key term
A soluble base that produces hydroxide ions, OH⁻, in water.
Used by AQA, Edexcel and OCR
Specification 4.4.2.2, 4.4.2.4 · Paper 1
A base that is soluble in water, such as sodium hydroxide.
Revise: Neutralisation and SaltsAn alkali is simply a base that dissolves in water: sodium hydroxide solution is an alkali, whereas copper oxide is an insoluble base.
A soluble base that produces hydroxide ions, , in aqueous solution.
Specification 3.1, 3.10, 3.13, 3.14, 3.16 · Paper 1
A soluble base that is a source of hydroxide ions, , when it is in solution.
Revise: Ion Sources in Acids and AlkalisAn alkali is a soluble base.
A base that is soluble in water.
A base that dissolves in water to form an alkaline solution.
A soluble base whose aqueous solution contains hydroxide ions, .
A soluble base that produces hydroxide ions when dissolved in water.
Specification C3.3c, C3.3d · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Acids and Alkalis IonsAn alkali is a soluble base.
A base that dissolves in water.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A soluble base that reacts with an acid to form a salt and water.
Revise: NeutralisationAn acid and an alkali have opposing chemical properties. When they react in the correct proportions, each removes the characteristic chemical effect of the other.
A soluble base whose solution contains hydroxide ions.
An alkali is a soluble base. Do not use “alkali” as a name for every base.
State that acids produce ions in solution and alkalis produce ions in solution; naming the ions without this condition is incomplete.
Use the one-way test precisely: every alkali is a base, but not every base is an alkali.
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