| Experiment 9.1 Preparing a natural indicator (NEW) | | |
| Experiment 9.2 Classifying solutions as acidic, alkaline or neutral (NEW) | | |
| Experiment 9.3 Using universal indicator solution to find the pH values of different solutions (NEW) | | |
| Experiment 9.4 Using pH paper to find the pH values of some substances (NEW) | | |
| Experiment 9.5 Using a pH meter to measure the pH values of some substances (NEW) | | |
| Experiment 9.6 Studying the change of pH value during neutralization (NEW) | | |
| Experiment 9.7 Are there any new substances formed during neutralization? (NEW) | | |
| Experiment 9.8 Is mass conserved in neutralization? (NEW) | | |
| Experiment 9.9 Reactions between acids and metals (NEW) | | |
| Experiment 9.10 Reactions between acids and building materials (NEW) | | |
| Experiment 9.11 Investigating the effect of acidic solutions of different pH values on the growth of seedlings (NEW) | | |
| Experiment 9.12 Corrosive effect of concentrated strong alkali (NEW) | | |