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Unformatted text preview: Question s: Evaporation, vapor pressure and separation by GC Name: Liz Zharovsky Bench #: C19 Lab day and section: Tuesday - 2 Q1: What kind of relationship is there between boiling points, vapor pressure and rates of evaporation? Discuss the differences in boiling points, vapor pressure and rates of evaporation of yours and your partner's liquids. Answer: The reached temperature of a liquid when the vapor pressure of the liquid is equivalent to the pressure of the gases above the liquid, this is considered the boiling point. Therefore, the lower the boiling point of a liquid, the more vapor pressure the liquid will have. The rate of evaporation correlates with the vapor pressure, so if a liquid has more vapor pressure, then the rate of evaporation will be increased. In the ethyl acetate, the boiling point was 77.0 ̊ C, which was lower than the isopropyl alcohol’s boiling point of 82.5 ̊ C. The ethyl acetate’s measured vapor pressure was 57.2 mmHg, whereas the isopropyl alcohol’s measure vapor pressure was 31.9 mmHg. This is consistent with the fact that lower boiling points have higher vapor pressures. Hence, it makes mmHg....
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This note was uploaded on 01/23/2012 for the course CHEM 18a taught by Professor Dolnik during the Fall '06 term at Brandeis.
- Fall '06