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Solution — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySolution5 Marks
Question
How is osmotic pressure determined by Berkeley-Hartley method ?
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Answer

In this method solvent and solution are taken as shown in the figure:
This method is based upon applying pressure on the solution which is just sufficient to prevent the entry of the solvent into the solution through the semi-permeable membrane. A semi-permeable membrane to fit into a bronze cylinder to which the piston is fitted and pressure gauge. The porous tube is fitted with a water reservoir on one side and a capillary indicator on the other side. The porous tube is filled with pure solvent. The bronze cylinder is filled with solution, the osmotic pressure of which is to be measured. As a result of osmosis, solvent in the porous
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cylinder tends to pass into solution through semipermeable membrane with the result the level in the capillary indicator moves down-wards. External pressure is then applied by the piston so that solvent level in the capillary becomes stationary. It indicates that osmosis has been stopped and now the pressure recorded by the pressure gauge gives the osmotic pressure of the solution.

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