Here's why:
* Boiling Point Difference: Octane has a higher boiling point (125.7 °C) compared to pentane (36.1 °C). This difference in boiling points is substantial, making them easily separable by distillation.
* Distillation Process: In distillation, the mixture is heated. The component with the lower boiling point (pentane) will vaporize first, leaving the higher boiling point component (octane) behind.
* Vapor Collection: The pentane vapor is collected and condensed back into liquid form, resulting in a pure pentane sample. The remaining liquid in the distillation flask is primarily octane.
Here's a simplified breakdown:
1. Heating: The mixture of octane and pentane is heated.
2. Vaporization: Pentane, with its lower boiling point, vaporizes first.
3. Condensation: The pentane vapor is cooled and condensed back into liquid form, separating it from the octane.
4. Collection: The pure pentane liquid is collected separately.
5. Remaining Octane: The liquid remaining in the distillation flask is primarily octane.
Therefore, the significant difference in boiling points between octane and pentane allows for efficient separation using distillation.
