a) What is the osmotic pressure in bar of a 0.10 M solution of urea in ethanol ?

Question

a) What is the osmotic pressure in bar of a 0.10 M solution of urea in ethanol ?

b) What is the osmotic pressure in bar of a 0.10 M solution of NaCl in water ?

c) An aqueous solution of osmotic pressure 5 bar is separated by a semipermeable membrane from an aqueous solution of osmotic pressure 2 bar. Which way will the solvent flow? How large a pressure must be applied to prevent this solvent flow?

d) What is the free-energy change for transferring 1 mol of water from a solution of osmotic pressure 5 bar to a solution of osmotic pressure of 2 bar?

Explanation / Answer

a)
I am considering room temperature
T = 298 K
i = 1 as it will not dissociate

P = i*C*R*T
   = 1*0.1*8.314*298
   = 247.76 N/m^2
    = 247.76 *10^-5 bar
    = 2.48*10^-3 bar

b)
I am considering room temperature
T = 298 K
i = 2 as NaCl will dissociate into Na+ and Cl-

P = i*C*R*T
   = 2*0.1*8.314*298
   = 495.5 N/m^2
    = 495.5 *10^-5 bar
    = 4.96*10^-3 bar

c)
Solvent flow from lower osmotic pressure to higher osmotoic pressure
SO solvent will flow from 2 bar side to 2 bar side
To prevent the flow pressure must become equal on both sides
So, a pressure of 3 bar should be applied on 2 bar side

All this are different questions as they are not part of a single question
I am allowed to answer only 1 at a time

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