Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
What types of substance is steam distillation applicable too? 4
|
are immiscible with water
non-reactive with water stable at 100 degrees C have a vapor pressure greater than 5 Torr at 100 degrees C |
|
|
How was steam generated in this experiment?
|
direct heating in situ
|
|
|
What is used to extract the distillate?
|
methylene chloride
|
|
|
Why shouldn't you shake the seperatory funnel vigorously during extraction?
|
may produce a stable emulsion where the layers separate slowly
|
|
|
Why is Na2SO4 used?
|
to remove excess water
|
|
|
Equation to determine partial pressure of water in steam distillation?
|
P(H2O) = 760 Torr - (vapor pressures of components)
|
|
|
How to calculate the amount of carvone that will distill out for every 1g of water that co distills?
|
g carvone/g water = (P carvone)(MW carvone)/(P water)(MW water)
|
|
|
What is the maximum boiling point for steam distillation?
|
the max temp. is always less than the boiling point of water because the heterogeneous mixture is immiscible
|
|
|
Advantages of Steam Distillation? 3
|
-distill liquids with high boiling points at temperature less than 100 degrees Celsius
-avoid high temp which could cause decomposition -can use vacuum distillation as an alternative |
