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Osmotic pressure is consequence of non zero net water diffusion, which is consequence of non equal water activities on both sides of semipermeable membrane, which is consequence of the fact dissolved solutes decrease activity of water. Osmotic pressure of a free solution is formally an external pressure needed to be acting on this solution to keep ...


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In addition to Poutnik's answer, I would like to add some comments on the question: The first statement 'Osmosis of water is not diffusion of water:....' is incorrect. The cause of osmosis is simply diffusion: the solvent is able to diffuse through the semi-permeable membrane the solute is not. It is wrong to assume that diffusion occurs only in the ...


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How does the solute produce an osomtic pressure? The solute creates a difference in the chemical potential of the solvent in two chambers separated by a selectively permeable membrane that allows passage only of the solvent. The system changes such as to reduce the imbalance in chemical potential and the only way for this to happen is by reducing the ...


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If there is a difference in osmolarity and therefore in the osmotic pressure, water flows from solution with lower osmotic pressure to the higher one, decreasing this difference and therefore the flow itself as well. The kinetic of this process follows the first order kinetics. The flow rate is proportional to the osmotic pressure difference. Therefore, the ...


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