Melting/Boiling Point Flashcards
What is vapor pressure?
The pressure exerted by the molecules in the vapor phase striking the walls of the container
How is vapor pressure equilibrium established?
When the number of molecules that escape into vapors equal those that return to the liquid surface
As vapor pressure rises….
Temperature Rises
What is the boiling point?
When vapor pressure equals atmospheric pressure
How do you find boiling point?
Microboiling point apparatus, elbow thiele tube, inverted capillary tube. Record temp when liquid reenters capillary tube (heat past bp, vapor pressure produces bubbles out bottom, cool, liquid reenters = equilibrium)
Like dissolves…
Like, polar dissolves polar
Why should you use powdered samples over crystal?
More evn distribution of heat
Least polar to most polar solvents?
Napthalene, benzoic acid, urea, NaCl
