Vernier Software and Technology
Vernier Software & Technology

Investigating LeChatelier’s Principle

Introduction

In LeChatelier’s words, this principle is stated:

Any system in stable chemical equilibrium, subjected to the influence of an external cause which tends to change either its temperature or its condensation (pressure, concentration, number of molecules in unit volume), either as a whole or in some of its parts, can only undergo such internal modifications as would, if produced alone, bring about a change of temperature or of condensation of opposite sign to that resulting from the external cause.

An alternate form of LeChatelier’s Principle is as follows: In chemistry, when a system at equilibrium is changed, the equilibrium will shift to counteract the change.

Objectives

This investigation will take advantage of your knowledge of LeChatelier’s Principle. It may also deepen understanding of equilibrium in general. The objective is to prepare six equilibrium systems in a set of test tubes that display the colors red, orange, yellow, green, blue, and violet.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

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

Vernier Chemistry Investigations for Use with AP* Chemistry

See other experiments from the lab book.

1Investigating Food Dyes in Sports Beverages
2Determining the Copper Content in Brass
3Investigating Water Hardness
4The Acidity of Juice and Soft Drinks
5Separating Molecules
6Identifying an Unknown Substance
7Investigating the Purity of a Mixture
8Determining the Percent Peroxide in a Commercial Product
9Investigating the Components of a Commercial Tablet
10The Effect of Acid Rain on a Marble Structure
11Investigating the Kinetics of a Crystal Violet Reaction
12Investigating Commercial Hand Warmers
13Investigating LeChatelier’s Principle
14Investigating Acid-Base Titrations
15The Buffering Ability of Commercial Products
16Testing the Effectiveness of a Buffer

Experiment 13 from Vernier Chemistry Investigations for Use with AP* Chemistry Lab Book

<i>Vernier Chemistry Investigations for Use with AP* Chemistry</i> 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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