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Tonicity is the ability of a solution to cause a cell to gain or lose water. It depends on the concentration of solutes that cannot cross the cell membrane.
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Hypotonic Solution: A solution with lower solute concentration (more water) compared to another solution.
Isotonic Solution: A solution whose solute concentration is equal to the solute concentration inside a cell.
Hypertonic Solution: A solution with higher solute concentration (less water) compared to another solution.