Question

(3) Read the question d u (4) Pay attention to points set for each question will (6) Do not talk while you are in the exam or look around or peep in at uit work. If you do so, this will disqualify you from continuing the exam and you will be asked to leave immediately without any explanation or discussion, STATION #.1. (6 Points) If a 25% salt solution is separated from at 35% salt solution by a selectively permeable membrane, (i) In which direction will there be a net movement of water? (2 points) (ii) Explain why? (2 points) (iii) What process will take place? (Write the name) (2 points)

Answer 1

1,2,3)

Osmosis occurs when two solutions of different concentrations are separated by a semipermeable membrane. The membrane allows solvent particles, but not solute particles, to pass through. Thus, the solvent moves toward the solution of higher concentration (to dilute it) until the two solutions have the same concentration, or until gravity overtakes the osmotic pressure, Π. The osmotic pressure between a solution and pure solvent depends on the number of solute particles and thus is a colligative property. It can be expressed as

Π=MRT

where M is the total molarity of the solute particles, R=0.08206L⋅atm/(K⋅mol) is the gas constant, and T is the Kelvin temperature.

So, therefore the solvent will pass towards the solution which is less has less concentration. 35% salt solution will pass towards the solution of 25% salt solution.

Osmosis will take place in this situation.

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