What is an isotonic solution?

Two solutions having the same osmotic pressure across a semipermeable membrane is referred to as isotonic solution. It has the same osmolarity (solute concentration), as another solution.

  • A solution is isotonic when its effective mole concentration is the same as that of another solution.
  • This state provides the free movement of water across the membrane without changing the concentration of solutes on either side.
  • Some examples of isotonic solutions are 0.9% normal saline and lactated ringers.
  • When a solution has a higher solute concentration than the solution present across the semi-permeable membrane, it is known as a hypertonic solution.

Articles to refer

  1. Write a short note on Osmosis
  2. What is a hypertonic solution
  3. What happens to a cell as it is placed in a Hypertonic Solution

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