Answered: Explain how osmotic pressure…

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.73E

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Question

Explain how osmotic pressure measurements can be used to determine the molar mass of a polymer.

Expert Solution

Step 1

The properties that depend on the number of solute particles are called colligative properties.

When a membrane is placed between the solvent molecules, the solvent molecules start to flow through the membrane, this flow of solvent is called osmosis. The pressure that just stops the flow of solvent is called the osmotic pressure of the solution.

Osmotic pressure depends on the number of solute molecules, so it is a colligative property.

Step 2

The Osmotic pressure is directly proportional to the molarity, C of the solution at temperature T. It is denoted by the letter $π$ ,

$π = CRT C is the concentartion, C = \frac{n}{V} V is the volume of solution conatining, n moles of solute .$

$π = \frac{n_{2}}{V} RT M i s t h e m o l a r m a s s o f t h e p o l y m e r, \frac{n_{2}}{V} = \frac{C}{M}$

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