| Word | Meaning |
| Salt | The neutral compound formed after the reaction of an acid and a base |
| Neutral salt | A salt made from a strong acid and a strong base, or from a weak acid and a weak base |
| Acidic salt | A salt made from a strong acid and a weak base |
| Basic salt | A salt made from a strong base and a weak acid |
| Ionisation | The process by which a salt separates into positive and negative ions on dissolving in water |
| Displacement | The pushing out of a less reactive metal from its salt by a more reactive metal |
| Indicator | A substance that changes colour to show an acid or a base, such as litmus, methyl orange and phenolphthalein |
| Washing soda | The common name of sodium carbonate |
| Baking soda | The common name of sodium bicarbonate |
| Antacid | A medicine that neutralises the extra acid in the stomach |