AQA GCSE Chemistry · 8462
Paper 1, Paper 2
A particle that donates a proton in a proton-transfer reaction.
Revise: Classification of Chemical ReactionsAn acid is the proton donor and a base is the proton acceptor.
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GCSE Chemistry · key term
A substance that forms hydrogen ions, H⁺, when it dissolves in water.
Used by AQA, Edexcel and OCR
Paper 1, Paper 2
A particle that donates a proton in a proton-transfer reaction.
Revise: Classification of Chemical ReactionsAn acid is the proton donor and a base is the proton acceptor.
Specification 3.1, 3.14 · Paper 1
A substance that is a source of hydrogen ions, , when it is in solution.
Revise: Ion Sources in Acids and AlkalisThe definition concerns the ions produced when the acid is dissolved in water, rather than merely the formula or name of the undissolved substance.
A substance that produces hydrogen ions, , when it dissolves in water.
Specification C3.3c, C3.3d, C3.3f · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Acids and Alkalis IonsWater does more than spread an acid through a liquid.
A substance that forms hydrogen ions when it dissolves in water.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A substance that forms hydrogen ions when it dissolves in water.
Revise: Ions in acids and alkalisWhen an acid dissolves in water, it forms hydrogen ions, H⁺. This is the feature shared by aqueous acid solutions, even though different acids contain different other particles.
A substance that produces hydrogen ions, H⁺, when dissolved in water.
State that acids produce ions in solution and alkalis produce ions in solution; naming the ions without this condition is incomplete.
In an explanation, identify the source of each reacting ion: the acid provides ions and the alkali provides ions.
If asked which ion is present in all aqueous acids, choose H⁺: chloride and sulfate ions occur only in particular acids.
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