AQA GCSE Chemistry · 8462
Specification 4.4.2.6 · Paper 1
A positively charged ion, written , produced by acids in aqueous solution.
Revise: Strong and Weak AcidsThe pH of a solution is related to its hydrogen ion concentration.
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GCSE Chemistry · key term
A positively charged ion, written as H⁺, whose concentration affects the pH of a solution.
Used by AQA, Edexcel and OCR
Specification 4.4.2.6 · Paper 1
A positively charged ion, written , produced by acids in aqueous solution.
Revise: Strong and Weak AcidsThe pH of a solution is related to its hydrogen ion concentration.
Specification 3.1, 3.4 · Paper 1
A positively charged ion written as . Acids produce these ions in solution.
A positively charged ion, H⁺, supplied by an acid in solution.
Specification C3.3c, C3.3i · Paper 1 (Foundation), Paper 3 (Higher)
A positively charged ion represented by H⁺ and formed when an acid dissolves in water.
Revise: Acids and Alkalis IonsThe chloride ion belongs to this particular acid; the hydrogen ion is the feature shared by aqueous acids.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A positively charged ion represented by H⁺.
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 positively charged ion, written as , whose concentration determines the pH of a solution.
State both the factor and the direction in pH questions: a decrease of 1 pH unit means 10 times the hydrogen ion concentration.
Do not confuse the ions: hydrogen ions are , whereas hydroxide ions are .
Do not confuse a lower pH with a lower hydrogen ion concentration.
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