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when the boiling point difference is less than 20 degrees; limited to larger samples in fractional distillation why are we using a GC in this experiment to determine the composition of the fractions I obtained from simple distillation
Vapor pressure-temperature diagra m for dichloromethane, water and d-limonene. The normal boiling point of a substance is defined as the temperature at which the vapor pressure of that substance equals atmospheric pressure, 760 mmHg.sually the temperature stabilizes slightly below the literature value for the boiling point and then slowly creeps up. When the temperature begins to drop, the distillation is halted by removing the heat from the distillation flask. As a safety precaution, distillations are never carried out to dryness.