* Safety: The thermometer is designed to measure temperature, not withstand the heat and potential pressure changes of a boiling mixture. It could break, creating a dangerous situation.
* Accuracy: The thermometer needs to measure the vapor temperature, not the liquid temperature. This is crucial to know when the desired component is being distilled.
* Distortion: Placing the thermometer in the mixture would affect the boiling point of the mixture, leading to inaccurate results.
Correct Placement:
The thermometer should be placed above the mixture, in the distillation head or adapter, so that the bulb is completely immersed in the vapor stream. This way, the thermometer accurately reflects the temperature of the vapor as it rises.
Let me know if you have any other questions about distillation setups!
