What is the osmotic pressure of the salt solution in reverse-osmosis?
Select one:
a. An equilibrium state where the amount of solvent passing in opposite directions is equal
b. An equilibrium state where the amount of solvent passing in one direction is greater than other direction
c. The pressure of one side of the reverse-osmosis system is greater than the other side
d. When the pressure allows the salt solutes to pass through the semipermeable membrane
e. The pressure is increased above the osmosic presure to reverse the flow of the water from salt solution to the fresh solvent
I know the answer is either c, d or e, but not sure which is the right one. Hope someone can help. Thanks.