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 .