IGCSE Chemistry: Acids, Bases and Salts | Questions by Topic

Past paper questions, key definitions, and mark schemes — all files verified from our archive.

• Acid: proton (H⁺) donor, pH < 7
• Base: proton (H⁺) acceptor
• Alkali: soluble base, pH > 7
• Neutralisation: acid + base → salt + water
• Strong acid: completely dissociates in water (e.g. HCl, H₂SO₄)
• Weak acid: partially dissociates (e.g. CH₃COOH)
• pH scale: 0-14, logarithmic (each step = 10× change in [H⁺])
• Titration: method to find concentration of unknown solution

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