Question
What is osmotic pressure? How is it dependent on the number of moles of a solute?
Solution
Answer:
The minimum excess pressure that has to be applied on the solution to prevent the entry of the solvent in to the solution through the semi-premeable membrane is called the osmotic pressure. It is given by:
n is the number of moles of solute.
v is volume of solution.
r is the universal gas constant.
T is the absolute temperature.
The minimum excess pressure that has to be applied on the solution to prevent the entry of the solvent in to the solution through the semi-premeable membrane is called the osmotic pressure. It is given by:
osmotic pressure is proportional to the molarity, C of the solution at a given temperature T. Thus:
Π = C R T
Here Π is the osmotic pressure and R is the
gas constant.
Π = (n2 /V) R T
n is the number of moles of solute.
v is volume of solution.
r is the universal gas constant.
T is the absolute temperature.
