| 1. |  |
 |
|
| 2. | |
| a) | concentration of sulphuric acid/ concentration/ concentration of solution |
| b) | Oxygen |
| 3. | |
| a) | Saturated solution |
| b) | i) Temperature (of the water) |
| ii) 52 g/ 100cm3 [accept 51-53] | |
| iii) [as the temperature increases] the mass dissolved increases |
