Starter quiz
- What is the pH range of acids?
- 0 to 6 ✓
- 1 to 6
- 0 to 7
- 1 to 7
-
- Which ion is primarily found in acids?
- Na⁺
- H⁺ ✓
- OH⁻
- Cl⁻
-
- What is the pH range of bases?
- 0 to 6
- 7 to 10
- 8 to 14 ✓
- 5 to 9
-
- Which ion is primarily found in bases?
- Cl⁻
- H⁺
- OH⁻ ✓
- Na⁺
-
- What does the pH scale measure?
- The acidity or alkalinity of a solution. ✓
- The concentration of solutes in a solution.
- The density of a solution.
- The temperature of a solution.
-
- What is produced when an acid reacts with a base?
- salt and water and carbon dioxide
- salt and hydrogen
- salt and water ✓
- salt and oxygen
-
Exit quiz
- Complete the general equation for a neutralisation reaction: acid + base -->
- salt + hydrogen
- salt + water ✓
- salt + oxygen
- salt + carbon dioxide
-
- Which ion is released by acids in solution?
- Na⁺
- Li⁺
- K⁺
- H⁺ ✓
-
- Which of the following statements are correct?
- All bases are alkalis.
- All alkalis are bases. ✓
- A base is a soluble alkali.
- An alkali is a soluble base. ✓
-
- What type of solution do non-metal oxides form when they dissolve in water?
- basic
- acidic ✓
- neutral
- alkaline
-
- Are metal oxides generally soluble or insoluble in water?
- insoluble ✓
- soluble
-
- What is another name for soluble bases?
- 'alkalis' ✓
Worksheet
Presentation
Video
Lesson Details
Key learning points
- A base is a substance that neutralises an acid to make salt and water only (this is a neutralisation reaction).
- Hydroxides are generally soluble bases (they contain OH⁻ ions).
- Metal oxides are bases that are generally insoluble.
- Non-metal oxides are soluble and form acidic solutions.
Common misconception
Pupils often believe that acids 'eat' away at substances, e.g. acid rain and limestone, rather than understanding that this is a chemical reaction.
Using familiar reactions between acids and bases, e.g. hydrochloric acid and sodium hydroxide or calcium carbonate, will provide evidence that a reaction has taken place (i.e. a change in temperature or producing a gas).
Keywords
Base - A substance that reacts with an acid to form a compound called a salt.
Soluble - A way of describing a substance that does dissolve in a particular solvent.
Insoluble - A way of describing a substance that does not dissolve in a particular solvent.
Hydroxide - A basic compound which contains an ion comprising of an oxygen and a hydrogen atom (OH⁻).
Neutralisation - A chemical reaction between an acid and base to produce a neutral solution including a salt and water.