Key Concept: Acids produce H+ ions in water, alkalis produce OH- ions. Neutralisation forms water.
Section A: Definitions
1. What is an acid in terms of ions? [1]
2. What is an alkali in terms of ions? [1]
Section B: Neutralisation
3. Write the ionic equation for neutralisation. [2]
4. Complete the word equation: acid + alkali -> ____ + ____. [2]
5. A solution has pH 2. What happens to pH when it is neutralised with sodium hydroxide? [2]
Total marks: 8
Mark Scheme
1. A source of H+ ions in water [1]
2. A source of OH- ions in water [1]
3. H+ + OH- -> H2O [2]
4. Salt + water [2]
5. pH increases towards 7 as acid is neutralised [2]