Which of the following is true regarding osmotic pressure? a. ...

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Which of the following is true regarding osmotic pressure?
 
  a. Osmotic pressure depends on the number of particles in solution.
  b. Osmotic pressure varies inversely with temperature.
  c. Osmotic pressure is highest in dilute solu-tions.
  d. Osmotic pressure varies inversely with to-nicity.

Question 2

If a 60 solution (A) were exposed to a 10 solution (B) across a semipermeable membrane, what would be the strength of each solution following equilibrium?
 
  a. Solution A 10/solution B 60
  b. Solution A 35/solution B 35
  c. Solution A 50/solution B 20
  d. Solution A 60/solution B 10

[IRincones]

Answer to Question 1

ANS: A
Osmotic pressure depends on the number of particles in solution but not on their charge or iden-tity. A 2 solution has twice the osmotic pressure of a 1 solution under similar pressures. For a given amount of solute, osmotic pressure is inversely proportional to the volume of solvent. Os-motic pressure varies directly with temperature, increasing by 1/273 for each 1 C.

Answer to Question 2

ANS: B
Osmotic pressure can also be visualized as an attractive force of solute particles in a concentrated solution. If 100 ml of a 50 solution is placed on one side of a membrane and 100 ml of a 30 solution is placed on the other side, solvent molecules will move from the dilute to the concen-trated side (Figure 13-2, D and E). The particles in the concentrated solution attract solvent mol-ecules from the dilute solution until equilibrium occurs. Equilibrium exists when the concentra-tions (i.e., ratio of solute to solvent) in both compartments are equal (40 in Figure 13-2).

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