Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

By Ritesh|Updated : November 13th, 2022

(a) Keep cup A empty

(b) Put one teaspoon of sugar in cup B

(c) Put one teaspoon of salt in cup C

(d) Put one teaspoon of sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:

(i) Explain why water gathers in the hollowed portion of B and C.

Solution:

Water gathers in the hollowed portions of potato cups B and C due to the occurrence of osmosis.

Why cup A's water level is the same as cup B's:

  • Inside cup A, there is no solution or solvent.
  • Therefore, there won't be any osmotic pressure in this situation.
  • Therefore, the water in the cup does not transfer from the outside to the inside.

The cause of the cup B's higher water level is:

  • The increase in water level in cup B is due to osmosis.
  • Through a semipermeable membrane, solvent molecules flow from a region of low solute concentration to a region of higher solute concentration. This process is known as osmosis.
  • In this instance, water enters the potato cup through a semi-permeable barrier made of potato cells.
  • In comparison to the medium outside of the potato cups, the medium inside has a higher percentage of sugar (solute).
  • Since the solvent is moving from a zone of low solute concentration to a region of higher solute concentration, water travels toward the interior of the potato cup.

Why cup C's water level is higher:

  • The increase in water level in cup B is due to osmosis.
  • Through a semipermeable membrane, solvent molecules flow from a region of low solute concentration to a region of higher solute concentration. This process is known as osmosis.
  • In this instance, water enters the potato cup through a semi-permeable barrier made of potato cells.
  • In comparison to the medium outside of the potato cups, the medium inside has a higher concentration of salt (solute).
  • Since the solvent is moving from a zone of low solute concentration to a region of higher solute concentration, water travels toward the interior of the potato cup.

Why cup D's water level is the same as cup A's:

  • Cured potatoes make up Cup D.
  • The cell membranes and all of the potato's cells once it has been boiled are dead.
  • Therefore, there isn't a membrane that osmosis could happen across.
  • As a result, the water level in cup D has not changed.

As a result, osmosis causes water to collect in the hollowed areas of potato cups B and C.

Summary:

Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

The occurrence of osmosis causes water to collect in the hollowed areas of potato cups B and C. Osmosis is a process where the molecules of a solvent pass from a solution of low concentration to a solution of high concentration through a semipermeable membrane.

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