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Was there a difference between the head temperature when the liquid first starte

ID: 988695 • Letter: W

Question

Was there a difference between the head temperature when the liquid first started to boil and the temperature when the first portion of distillate was collected? Explain. What would be the effect of having the thermometer above the side arm of the three-way collecting tube? If two miscible liquids are each found to boil at exactly the same temperature, could you safely conclude that they are identical? Why? What is the purpose of the boiling chips? How would the observed temperature be affected if a distillation were performed on the top of a mountain? Explain. Why should water enter a condenser at the lowest point and leave at the highest point?

Explanation / Answer

No there was no difference between the head temperature when the liquid first started to boil and the temperature when the first portion of distillate was collected because in distillation process the liquid with the lower boiling point will typically evaporate first. The vapor of this liquid will pass into a condensing column, where it can revert into a liquid (condense) on the cool glass where it trickles into a collection flask at the same temperature.