AQA GCSE Chemistry · 8462
Specification 4.4.2.4 · Paper 1
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GCSE Chemistry · key term
A solution in which an acid produces hydrogen ions, ; it has a pH below 7.
Used by AQA, Edexcel and OCR
Specification 4.4.2.4 · Paper 1
Specification 3.3, 6.10 · Paper 1, Paper 2
A solution with a pH below 7 in which the acid is a source of hydrogen ions, H⁺.
A solution that contains hydrogen ions, H⁺, and has a pH below 7.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A solution with a pH below 7 and a relatively high concentration of hydrogen ions.
Revise: Neutrality and acidityFor two acidic solutions, compare their values below 7: the lower pH is the more acidic solution. For two alkaline solutions, compare their values above 7: the higher pH is the more alkaline solution. If one solution has pH 7, it is neutral rather than a weak acid or weak alkali.
Distinguish hydrogen chloride gas, HCl(g), from hydrochloric acid, HCl(aq): the acidic solution forms when the gas dissolves in water.
When comparing two acidic solutions, the one with the lower pH is more acidic. When comparing two alkaline solutions, the one with the higher pH is more alkaline.
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