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Experiments​

Acid Dissociation Constant, Ka

Experiment #27 from Chemistry with Vernier

Education Level
High School
Subject
Chemistry

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 sensors and equipment. Additional equipment may be required.

Option 1

Go Direct® pH Sensor

Option 2

pH Sensor

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Purchase the Lab Book

This experiment is #27 of Chemistry with Vernier. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.

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<i>Chemistry with Vernier</i>
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