If a 0.100 M solution of potassium sulfate has an osmotic pressure of 5.68 atm at 25.0 C, what is the i value for the solution?

Answer 1

Osmotic pressure = ∏ = iMRT

∏ = 5.68 atm

i = vant Hoff factor = ?

M = molarity = 0.199 mol/L

R = gas constant = 0.0821 Latm/Kmol

T = temperature in. k = 25 + 273 = 298K

5.68 atm = (i)(0.100)(0.0821)(298)

i = 5.68 / 2.447

i = 2.32 (theoretical value = 3)