Question

Briefly explain the laws of osmotic pressure.

Answer 1

The van't Hoff theory describes that substances in dilute solution obey the ideal gas laws, resulting to theosmotic pressure formula π = (n/V)RT = [Ci]RT where R is the gas constant, T the absolute temperature, and [Ci] the molar concentration of solute i in dilute solution (1).

Answer 2

Vant Hoff's Boyle's law :

At constant temperature, the osmotic pressure of a gas is directly proportional to its concentration and inversely proportional to its volume.

π/C = Constant or πV =  constant

Vant Hoff's Charle's law :

the osmotic pressure of a gas is directly proportional to absolute temperature.

π/T = Constant

Combining all these, the general equation is π = CRT