This topic summary covers Knowledge Organiser: Neutralisation within Neutralisation Reactions for GCSE Chemistry. Revise Neutralisation Reactions in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 13 of 13 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Knowledge Organiser: Neutralisation
Key Terms
- Neutralisation: acid + base → salt + water
- Ionic equation: H⁺ + OH⁻ → H₂O
- Salt: ionic compound from acid-base reaction
- Base: reacts with acid to neutralise it
- Spectator ion: unchanged in reaction
Must-Know Facts
- Acid + Metal → Salt + H₂ (squeaky pop)
- Acid + Metal Oxide → Salt + Water
- Acid + Hydroxide → Salt + Water
- Acid + Carbonate → Salt + Water + CO₂
- Salt name: metal from base + acid ending
- HCl → chloride; H₂SO₄ → sulfate; HNO₃ → nitrate
Key Equations
- H⁺ + OH⁻ → H₂O (ionic equation for neutralisation)
- Mg + H₂SO₄ → MgSO₄ + H₂ (metal + acid)
- CuO + H₂SO₄ → CuSO₄ + H₂O (metal oxide + acid)
- Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂ (carbonate + acid)
Common Mistakes
- Forgetting CO₂ in carbonate reactions: Acid + carbonate always produces three products — salt, water AND carbon dioxide
- Getting the salt name wrong: The first part comes from the metal/base, the second from the acid (HCl → chloride, H₂SO₄ → sulfate, HNO₃ → nitrate)
- Missing hydrogen gas from metal + acid: When a metal reacts with acid, hydrogen gas is produced — test with a burning splint (squeaky pop)
- Not writing the ionic equation correctly: The ionic equation for any neutralisation is always H⁺ + OH⁻ → H₂O — Na⁺ and Cl⁻ are spectator ions
Practice questions for Neutralisation Reactions
Which word equation correctly represents a neutralisation reaction?
Explain why the ionic equation for any strong acid-alkali neutralisation is always H⁺(aq) + OH⁻(aq) → H₂O(l).
Quick recall flashcards
HCl + NaOH → ?
NaCl + H₂O
(sodium chloride + water)
HNO₃ + NaOH → ?
NaNO₃ + H₂O
(sodium nitrate + water)