Colligative Properties and Raoult's Law


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What happens to vapor pressure when you add a solute to a solution?

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1. What is osmotic pressure?


9.0g of urea (a nonelectrolyte) is dissolved in 360 g water to create a solution. The temperature of the solution is 25.0°C. If the vapor pressure of water at 25.0°C is 23.80 mmHg, calculate the vapor pressure of the urea solution at 25.0°C in mmHg.

The molar mass of urea 60g/mol and water is 18g/mol.

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About This Quiz & Worksheet

These resources are designed to help you gain a better grasp of what you know on colligative properties and Raoult's Law. Some terms you'll be assessed on include colligative property and osmotic pressure.

Quiz & Worksheet Goals

This quiz and worksheet go over:

  • How to best describe a colligative property
  • The effect the addition of a solute has on vapor pressure
  • Raoult's Law
  • The formula used to calculate osmotic pressure
  • Osmotic pressure

Skills Practiced

You can also practice the following skills:

  • Making connections - use understanding of the concept of what adding a solute does to vapor pressure
  • Information recall - access the knowledge you've gained regarding osmotic pressure and how it can be determined
  • Defining key concepts -ensure that you can accurately define main phrases, such as Raoult's Law and colligative property

Additional Learning

For additional information on the colligative properties, review the lesson entitled Colligative Properties and Raoult's Law. The lesson covers objectives such as:

  • Define vapor pressure
  • Understand how to apply Raoults law through examples
  • Know the steps for using the osmotic pressure formula to calculate molar mass