The bag changed its shape because water moved from the side with a higher water potential to the bag interior, where there is a lower water potential.
What is osmosis?
Osmosis is the simple passive transport of water molecules that occurs when two dilutions of different concentrations -in this example, the interior of the Visking bag and water- are separated by a semipermeable membrane.
The membrane allows the pass of water but not solute (sugar). Hence, water can move from the most diluted side to the less diluted one. This is, from the side of the membrane with higher water potential, to the side with lower water potential.
Let us remember that the water potential is the potential energy in a mass of water. Among other factors, it depends on solute concentration,
- Most diluted side ⇒ higher water potential
- Most concentrated side ⇒ lower water potential
In the exposed example, water tends to go from the hypotonic solution (higher water potential) to the bag interior (lower water potential) and keeps doing so until concentrations are equal in the bag interior and exterior.
The bag has changed its shape because as water moved, the bag began to enlarge and became bigger-sized.
You can learn more about water potential at
https://brainly.com/question/23855783
