0.1 M NaCl and 0.05 M BaCl2 solutions are separated by a semi-permeable membrane in a container. For this system, choose the correct alternative:a)There is no movement of any solution across the membraneb)Water flows from BaCl2 solution towards NaCl solutionc)Water flows from NaCl solution towards BaCl2 solutiond)Osmotic pressure of 0.1 M NaCl solution is lower than the osmotic pressure of BaCl2Correct answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:

Osmosis is the movement of solvent molecules across a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration. In this case, water molecules will move from the region of lower solute concentration (0.1 M NaCl) to the region of higher solute concentration (0.05 M BaCl2).

The correct answer is option 'B', which states that water flows from BaCl2 solution towards NaCl solution.

Reasoning:

To understand why water moves from BaCl2 solution towards NaCl solution, we need to calculate the osmotic pressure of each solution.

Osmotic pressure (π) is defined as the pressure required to prevent the movement of solvent molecules across a semi-permeable membrane. It is given by the equation:

π = MRT

where M is the molar concentration of the solute, R is the gas constant, and T is the temperature in Kelvin.

Let's calculate the osmotic pressure of each solution:

Osmotic pressure of NaCl solution:

M = 0.1 M
R = 0.082 L atm/mol K
T = 298 K

π = MRT
π = (0.1)(0.082)(298)
π = 2.44 atm

Osmotic pressure of BaCl2 solution:

M = 0.05 M (Note that BaCl2 dissociates into three ions in solution: Ba2+, 2Cl-. Hence, the effective molarity of BaCl2 is 0.15 M)
R = 0.082 L atm/mol K
T = 298 K

π = MRT
π = (0.15)(0.082)(298)
π = 3.66 atm

Since the osmotic pressure of BaCl2 solution is higher than that of NaCl solution, water molecules will move from BaCl2 solution towards NaCl solution to equalize the concentration of solutes on both sides of the membrane.

Therefore, option 'B' is the correct answer.

Answer

The question is about Osmosis. In Osmosis water flows from *water's* high concentration to *water's* low concentration. That means from the lower concentration of solution to the higher concentration of solution. So the answer is Option B.

But before checking the concentration we need to see if the osmotic pressure is different or same for the sides. Because if osmotic pressure is same, there would be no net flow of water (i.e. isotonic solutions). So to calculate osmotic pressure the formula is π=i*c*R*T (i=van't hoff factor, c is concentration)

If you calculate π i.e. osmotic pressure, it's different for both the solutions. So there would be the flow of water n Concentration decides the net flow as I explained in the above para.

I hope it helps! :)

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