in distillation, would increasing the heating rate affect the boiling point? why? explain in terms of vapour pressure and the pressure of the laboratory.
2007-08-15 12:14:54 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Increasing the heating rate would make the substance boil faster, but will not change the boiling point.
The BP, as with the vapor pressure you mention, is an Intrinsic Property of the substance.
The pressure in the lab will affect the boiling point. The lower the pressure, the lower the BP will be, because during heating, the vapor pressure reaches the ambient pressure faster.
2007-08-15 12:53:29 · answer #1 · answered by reb1240 7 · 0⤊ 0⤋
If you are using batch distillation (which is usually the case in a lab), the boiling temperature will increase as the lighter component boils off at a greater rate than the heavier component boils off. If you increase the rate of heating, the increase in boiling temperature will occur at a greater rate.
If you are using continuous distillation, the boiling point will not be affected, as the composition of the boiling mixture will not change.
2007-08-15 21:17:37 · answer #2 · answered by David H 4 · 0⤊ 0⤋