Page 38 - Pharmaceutics IV (02-06-01305)
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                                 Isotonicity

69

    Pharmaceutical requirements  Isotonicity

    Theory

    • If a solution is placed behind a membrane that is permeable only to

    solvent molecules and not to solute molecules (a semipermeable

    membrane), osmosis occurs as the molecules of solvent (lower

    molecular weight) traverse the membrane to achieve equilibrium.

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Salma E. EL-Habashy
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