If a 0.014M aqueous solution of the unknown compound has an osmotic pressure of 0.905 atm at 25 degree celcuis what is the van’t Hoff factor, for this substance in the solution

Answer 1

Osmotic pressure (π) = iMRT

π = 0.905 atm

i = van't Hoff factor = ?

M = molarity = mols solute/liter solution = 0.014

R = gas constant = 0.0821 Latm/Kmol

T = temp in K = 25ºC + 273 = 298K

Solving for i, we have...

i = π / MRT

i = (0.905) / (0.014)(0.0821)(298)

i = 2.6