Example of osmosis Figure

a. Solutions 1 and 2 are separated by a semipermeable membrane. Solution 1 contains a solute that is too large to cross the membrane. Solution 2 is pure water. The presence of the solute in solution 1 produces an osmotic pressure.

Semipermeable membrane

O O O

o o o

o o o

o o o

1

Water flows by osmosis from 2->1

o

o

o

o

o

o

o

o

o

o

o

o

Figure 1-3. Osmosis of H20 across a semipermeable membrane.

b. The osmotic pressure difference across the membrane causes water to flow from solution 2 (which has no solute and the lower osmotic pressure) to solution 1 (which has the solute and the higher osmotic pressure).

c. With time, the volume of solution 1 increases and the volume of solution 2 decreases.

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