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GCSE Combined Science · key term
A substance that produces hydrogen ions, , in aqueous solution.
Used by AQA and Edexcel
Specification 5.4.2.1, 5.4.2.4 · Paper 3
A substance that produces hydrogen ions, , when dissolved in water.
Revise: Reactions of Acids with MetalsMagnesium, zinc and iron react with dilute hydrochloric acid and dilute sulfuric acid.
A substance that produces hydrogen ions, , in aqueous solution.
Specification Acids · Paper 3, Paper 4
Revise: Acids, alkalis, pH and acid strengthIn an acid, blue litmus turns red, while red litmus stays red. In an alkali, red litmus turns blue, while blue litmus stays blue. A neutral solution changes neither red nor blue litmus paper.
Use the acid to choose the salt ending: hydrochloric acid forms chlorides; sulfuric acid forms sulfates.
Use ‘more acidic’ for a lower pH and ‘more alkaline’ for a higher pH. A pH value alone does not tell you whether an acid is strong or weak.
Compare strong and weak acids at the same concentration when explaining their different pH values.
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