Question

Under what circumstances does osmosis stop?

• A. When the concentration of both the solutes becomes equal.
• B. When concentration of both the solvents becomes equal.
• C. When concentration of both the solutions becomes equal.
• D. None of the above

Answer 1

The correct option is A When the concentration of both the solutes becomes equal.

Osmosis is defined as the net flow or movement of solvent molecules through a semipermeable membrane through which solute molecules cannot pass. Eventually the added weight of the extra water on the left causes enough pressure to stop osmosis.
When the membrane is highly permeable to solute as well as to water, no water flow will occur and, therefore, the externally applied pressure required to stop osmosis is zero.