Question

• BX B
Vapour pressure of solution
pg
p=pa+PB
po
A
PB
Vapour pressure →
PA
XA =1
XB = 0
Mole fraction
XB -
XA=0
XB = 1
- XA
Fig. 2.2: Vapour pressure diagram
showing positive deviation​

Answer 1

Answer:

Therefore, the vapor pressure is greater than expected from the Raoult's law, showing positive deviation. If the deviation is large, then the vapor pressure curve shows a maximum at a particular composition and form a positive azeotrope. Laws of positive deviation

LAWS OF POSITIVE DEVIATION:

Positive Deviation from Raoult's Law occurs when the vapour pressure of the component is greater than what is expected in Raoult's Law. For Example, consider two components A and B to form non-ideal solutions.