Calculation of Molar Mass from Osmotic Pressure
Classification of solutions on the basis of osmotic pressure
= 1 / 185000 mol X 1 / 0.45L X 8.314 X 10 3 Pa L K-1 mol-1 X 310K = 30.98 Pa = 31 Pa
Calculation of Molar Mass from Osmotic Pressure
In dilute solutions the osmotic pressure is proportional to the molarity, C of the solution at a given temperature T. Mathematically,
ð = C R T R = gas constant ð = osmotic pressure =( n2 / V) RT V = Volume of a solution in litres n2 = Moles of solute. w2 = Grams of solute
M2 = Molar mass Now, n2 = w2 / M2
Classification of solutions on the basis of osmotic pressure
On the basis of osmotic pressure solution can be classified into three broad categories.
1. Isotonic solutions: Two solutions possessing same osmotic pressure at a given temperature are termed as isotonic solution. No osmosis occurs on isolation of these solutions when isolated through a semipermeable membrane.
2. Hypertonic solutions: In the event that the medium has a lower convergence of water than the cell, implying that it is a concentrated solution, the cell will lose water by osmosis.. Such a solution is known as a hypertonic solution. Once more, water crosses the cell layer in both directions, yet this time more water leaves the cell than enters it. In this manner the cell will shrink.