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Vapor Pressure and Heat of Vaporization Investigations

Figure from experiment 14 from Investigating Chemistry through Inquiry

Introduction

When a volatile liquid is added to a closed container such as an Erlenmeyer flask, it will evaporate into the air above it in the container. Eventually, equilibrium is reached between the rate of evaporation and the rate of condensation. At this point, the vapor pressure of the liquid is equal to the partial pressure of its vapor in the flask.

Objectives

In the Preliminary Activity, you will determine the vapor pressure of ethanol at room temperature using a Gas Pressure Sensor and a Temperature Probe. You will first measure air pressure at room temperature. You will then add ethanol to the flask and, once equilibrium has been established, measure the total pressure exerted by air and ethanol vapor. You will then subtract air pressure from the total pressure to determine the vapor pressure of ethanol at that temperature.

After completing the Preliminary Activity, you will first use reference sources to find out more about vapor pressure before you choose and investigate a researchable question dealing with vapor pressure.

Sensors and Equipment

This investigation features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Investigating Chemistry through Inquiry »

Investigation 14 from Investigating Chemistry through Inquiry Lab Book

<em>Investigating Chemistry through Inquiry</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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