Exercise 1 — IGCSE 0654 Jun 2025 Paper 32 Q5
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Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry
Acids Bases Ph
Key knowledge — Acids Bases Salts
Formulas & equations
acid + metal → salt + hydrogenacid + metal oxide → salt + wateracid + metal hydroxide → salt + water (neutralisation)acid + metal carbonate → salt + water + carbon dioxide
Key facts & rules
- Acid: produces H⁺ ions in solution. pH < 7.
- Alkali: produces OH⁻ ions in solution. pH > 7. (Bases that dissolve in water.)
- Neutralisation: H⁺ + OH⁻ → H₂O.
- pH scale: 0–14. pH 7 = neutral. Strong acids have lower pH than weak acids at same concentration.
- Strong acid: fully dissociates (HCl, H₂SO₄, HNO₃). Weak acid: partially dissociates (CH₃COOH).
- Making insoluble salts: mix two solutions containing the required ions → filter the precipitate.
- Making soluble salts: add excess solid acid/metal/metal carbonate to acid → filter → evaporate.
- Titration: used to find exact volume of acid/alkali needed for neutralisation.
IGCSE Chemistry — Acids, bases & pH
171 Cambridge IGCSE 0654 questions on acids, bases & ph, across all three components.
About acids, bases & ph on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on acids, bases & ph (Acids, bases & salts, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Theory
Acids, bases & pH — Core theory questions18 total · Paper 3
Exercise 2 — IGCSE 0654 Nov 2025 Paper 32 Q5
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Exercise 3 — IGCSE 0654 Jun 2025 Paper 33 Q5
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Acids, bases & pH — Extended theory questions16 total · Paper 4
Exercise 4 — IGCSE 0654 Nov 2025 Paper 41 Q7
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Exercise 5 — IGCSE 0654 Mar 2025 Paper 42 Q6
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Exercise 6 — IGCSE 0654 Nov 2025 Paper 42 Q8
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Multiple choice
Acids, bases & pH — Core multiple choice questions63 total · Paper 1
Exercise 1 — IGCSE 0654 May/June 2025 Paper 11 Q21
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Correct answer: A
Exercise 2 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q21
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Correct answer: C
Exercise 3 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q22
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Correct answer: B
Exercise 4 — IGCSE 0654 May/June 2025 Paper 11 Q23
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Correct answer: C
Acids, bases & pH — Extended multiple choice questions47 total · Paper 2
Exercise 5 — IGCSE 0654 May/June 2025 Paper 21 Q6
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Correct answer: C
Exercise 6 — IGCSE 0654 Oct/Nov 2025 Paper 21 Q18
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Correct answer: B
Exercise 7 — IGCSE 0654 Oct/Nov 2025 Paper 21 Q19
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Correct answer: C
Exercise 8 — IGCSE 0654 May/June 2025 Paper 21 Q24
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Correct answer: D
Alternative to practical
Exercise 1 — IGCSE 0654 May/June 2025 Paper 61 Q3
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Exercise 2 — IGCSE 0654 Oct/Nov 2025 Paper 61 Q3
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Exercise 3 — IGCSE 0654 May/June 2025 Paper 61 Q6
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Exercise 4 — IGCSE 0654 Oct/Nov 2025 Paper 61 Q6
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Exercise 5 — IGCSE 0654 Oct/Nov 2025 Paper 62 Q4
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