- Acid: a proton (H+) donor
- Base: a proton (H+) acceptor e.g. metal oxides, hydroxides, carbonates and ammonium
- Alkali: a base that is soluble in water and releases OH- ions into the solution
- Salt: a compound formed when the H+ of an acid is replaced by a positive metal ion
Strong acid: an acid that completely dissociates into it's ions in solution
E.g. HCl (aq) ---> H+ (aq) + Cl- (aq)
Weak acid: an acid that partially dissociates into it's ions in solution
E.g. CH3COOH (aq) <---> H+ (aq) + CH3COO- (aq) (<---> means reaction is incomplete)
Neutralisation: the reaction of an acid and a base to form a salt (chloride, sulfate, ethanoate salts)
- Acid + metal ---> salt + hydrogen
- Acid + base ---> salt + water
- Acid + carbonate ---> salt + water + carbon dioxide
- Ionic equation for acid + alkali (soluble base) H+ (aq) + OH- (aq) ---> H2O (l)
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