### 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.