Question

Consider the figure and mark the correct option.
(a) Water will move form side (A) to side (B) if a pressure
lower than osmotic pressure is applied on piston (B)
(b) Water will move from side (B) to side (A) if a pressure
greater than osmotic pressure is applied on piston (B)
(c) Water will move from side (B) to side (A) if a pressure
equal to osmotic pressure is applied on piston (B)
(d) Water will move from side (A) to side (B) if pressure
equal to osmotic pressure is applied on piston (A)

Answer 1

Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B)

• Option (b) is correct.
• Reverse osmosis is a process which states that "If a pressure higher than the osmotic pressure is applied to the solution the solvent will flow from the solution into the pure solvent through the semi-permeable membrane."
• Hence, in this case, the water will move from the side (B) to side (A) if a pressure greater than the osmotic pressure is applied on piston (B).

Answer 2

Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B).

Explanation:

• Osmotic pressure is the pressure that is to be applied to stop the movement of the solvent from a less concentrated solution to a more concentrated solution.

• This pressure when not applied on the solution, the solvent from lower concentration moves to higher concentration.

• But when the pressure equal to this is applied on the solution of higher concentration, then the solvent from the lower concentration cannot pressurise the other solution and so cannot enter.

• Now if the pressure more than the osmotic pressure is applied to the solution of higher concentration, then solvent will move from the higher concentration to the lower concentration.

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