A formulator is choosing an alcohol for a water-based cleaning fluid. Two unlabelled bottles contain propanol and butanol.
The formulator adds 15 cm³ of each alcohol to separate samples containing 50 cm³ of water. Each mixture is shaken and then left to settle.
| Bottle | Observation after settling | pH of the aqueous layer |
|---|---|---|
| P | One clear layer | 7 |
| Q | Two layers | 7 |
Explain which bottle contains propanol and which bottle contains butanol. State what the pH results show about the aqueous solutions of the two alcohols.