Question

Study osmosis using parchment paper or a similar membrane.

Answer 1

Materials Required

1. Parchment paper (or any semi-permeable membrane like dialysis tubing).
2. Two small glass jars or beakers.
3. Water.
4. Sugar or salt (to make a concentrated solution).
5. Thread or rubber bands.
6. A dropper or measuring spoon.
7. Food coloring (optional, for better visibility).

Procedure

1. Prepare the Semi-Permeable Membrane:

   • Cut a piece of parchment paper or similar material to form a small pouch.
   • Tie the edges with a thread or rubber band to create a watertight pouch, leaving an opening.

2. Prepare the Solutions:

   • Fill one jar or beaker with plain water.
   • Prepare a concentrated sugar or salt solution in another jar. Optionally, add food coloring to the solution for better observation.

3. Fill the Membrane:

   • Pour the concentrated sugar or salt solution into the parchment pouch and tie the opening securely.

4. Submerge the Pouch:

   • Place the pouch in the jar with plain water. Ensure it is fully submerged.

5. Observe:

   • Over time, observe changes in the pouch. Water from the jar will move into the pouch due to osmosis, causing it to swell.