Osmometry Flashcards
1
Q
osmometry
A
absolute technique
determines Mn
2
Q
disadvantage
A
lacks polydispersity
colligative property: depends on # particles in soln (not size)
3
Q
how does it work?
A
semipermeable membrane
solvent pass freely (small)
polymer strapped (large)
4
Q
osmotic pressure (pi)
A
difference in levels
pressure needed to prevent solvent from flowing over
dependent on # molecules
determine Mn
5
Q
Vant Hoff
A
calculate Mn if given osmotic pressure data and concentration/Temp
y-intercept = RT/Mn
