In a vacuum distillation the boiling point of glycerin is reduced to _?
Correct answer: D. 210°C
- A. 290°C
- B. 110°C
- C. 156°C
- D. 210°C
Explanation
Correct option is D. Under vacuum, the boiling temperature of glycerin decreases to 210°C at 50 torr. It is distilled at this temperature without decomposition for purification. Vacuum distillation is the distillation carried on under reduced pressure so that the liquid being distilled boils at a lower temperature than under atmospheric pressure and consequently with less chance of decomposition compared to molecular distillation.
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