Question #9d10b

1 Answer
Jul 22, 2017

Answer:

The Berkeley-Hartley method is a technique for measuring the osmotic pressure of a solution.

Explanation:

The apparatus consists of two concentric tubes.

The inner tube is made of a semipermeable membrane with two end-tubes. It contains the solvent (usually water).

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The outer tube contains the solution.

Osmosis of water from the inner tube to the solution causes the level of fluid in the capillary indicator tube to fall.

A piston applies external pressure to the outer tube to oppose the osmotic pressure and keep the level in the capillary tube stationary.

This pressure, as read from a manometer or pressure gauge, is equal to the osmotic pressure.