Simple Distillation Flashcards
Color of distillate
Colorless
Odor of distillate
Rubbing alcohol
Give the possible reason/s for the significant difference of boiling point of ethanol
The remaining liquid in the distillation flask becomes richer in ethanol; Ethanol has a higher boiling point compared to water, so as its concentration increases the overall boiling point will also increase
What are the components of the distillate collected at 79°C to 96°C range
Mixture of H2O + ethanol
Is simple distillation effective in separating ethanol from its aqueous mixture
No
Suggest ways and methods that can increase the yield in purity of ethanol distillate
Extent distillation time; (adjust heating level) use medium heat, add boiling chips, insulate distilling flask and test tube
What are the factors that affect the efficiency of a simple distillation
Boiling point, difference, concentration of components, temperature control, distillation apparatus, superheating, irregular bumping/ebullition, temp. fluctuations
Why dangerous to distill organic compounds in an assembly that is tightly closed at every point and has no opening
It will expand and create pressure inside, without opening to release pressure in can build up potentially casing apparatus to rupture or explode
Why dangerous to distill low-boiling liquid as tuba using Bunsen burner
The heat can cause rapid overheating of the distillation flask especially in low boiling liquids. It can cause to thermal decomposition of the liquids, production of flammable vapors, and risk of explotion
Why should distilling flask filled not more than 2/3 full of the sample
Reduces the risk of liquid being ejected from flask due to violent boiling/pressure build-up, minimizing the risk of burns and accident
How is the purity of distillate determined qualitatively
Through looking at boiling point or observe how clear and colorless distillate is. A boiling point close to literature value indicates high purity
