2 лекция - коÐ&

2 лекция - коÐ&

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Lecture №2 1.Topic: Solutions. Colligative properties of diluted solutions of non electrolytes and electrolytes. 2.Aim : to study colligative properties solution allows to understand essence an osmotic processes in organism. 3. Plane and thesis of lecture: 3.1. Plane of lecture 1. Solution. Significance of solution in vital activity of organism. 2. Colligative properties of non electrolytes 3. Osmosis. Osmotic and oncotic pressure. Vant-Hoff’s law. 4. Raul’s law and its effects. 5. Colligative properties of electrolytes 6. Ebuliometry, cryoscopy, osmometry and its medico-biological application. 3.2. Thesis of lecture Properties of diluted solution of non electrolytes, not dependent by nature solute, but dependent only from number of its particles in solution called colligative. To it relate: osmosis, decreasing of the pressure pair solvent on solution, decreasing of the temperature of the freezing and increasing of the temperature of the boiling solution comparatively clean solvent. Osmosis. Osmotic pressure The phenomenon of osmotic pressure is illustrated below. The two solutions are separated by a semi permeable membrane, which allows solvent molecules to pass through but blocks the passage of solute molecules. At the start, the water in a tube is the same as in the vessel. After some time, the level in the tube begins to rise; this continues until equilibrium is reached. The net movement of solvent molecules through a semi permeable membrane from a pure solvent or from a dilute solution to a more concentrated solution is called osmosis. The osmotic pressure (π) of a solution is the pressure required to stop osmosis from pure solvent into the solution. This pressure can be measured directly from the difference in fluid levels. Semi-permeable membranes are natural or artificial pellicles having pores. They are able to pass
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This note was uploaded on 11/29/2011 for the course RWR fref taught by Professor Erf during the Spring '11 term at Audencia Nantes Ecole de Management.

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2 лекция - коÐ&

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