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Hypotonic solutions are characterized by their osmolarity being lower than that of the body's cells. Typically, the osmolarity of human body fluids is around 300 mOsm/L. A hypotonic solution has an osmolarity that is significantly less than this, generally considered to be lower than 250 mOsm/L.

In a hypotonic solution, the lower concentration of solutes compared to the interior of the cells can lead to water moving into the cells by osmosis. This can cause the cells to swell and potentially burst. The correct identification of hypotonic solutions is crucial in medical settings, particularly in intravenous fluid administration, to avoid cellular damage due to osmotic imbalances.

Therefore, identifying the correct osmolarity range for hypotonic solutions helps in understanding how these solutions can interact with cells and is fundamental knowledge for healthcare practitioners.