Vernier Software and Technology
Vernier Software & Technology

Acid Dissociation Constant, Ka

Figure from experiment 27 from Chemistry with Vernier

Introduction

Acetic Acid, HC2H3O2, is a weak acid that dissociates according to this equation:

{\text{H}}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{3}}}{{\text{O}}_{\text{2}}}{\text{(aq)}} \to {{\text{H}}^{\text{ + }}}{\text{(aq)  +  }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{3}}}{{\text{O}}_{\text{2}}}^{\text{ - }}{\text{(aq)}}

In this experiment, you will experimentally determine the dissociation constant, Ka, for acetic acid, starting with solutions of different initial concentrations.

Objectives

In this experiment, you will

  • Gain experience mixing solutions of specified concentration.
  • Experimentally determine the dissociation constant, Ka, of an acid.
  • Investigate the effect of initial solution concentration on the equilibrium constant.

Sensors and Equipment

This experiment 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 Chemistry with Vernier »

Experiment 27 from Chemistry with Vernier Lab Book

<em>Chemistry with Vernier</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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