Education Technology

Interactive pH Titration

Published on 07/16/2011

Activity Overview

In this lesson, students will explore an interactive titration curve for a weak acid-strong base titration. Students will learn how acid concentration, acid ionization constant, and base concentration affect the titration.

Objectives

  • Students will observe how the features of a weak acid-strong base titration curve change when varying the acid ionization constant and/or the concentrations of the weak acid and strong base.
  • Students will determine an equation for the volume of base added at the equivalence point.
  • Students will relate pH to pKa at the "halfway" point in a titration. They will see that pH changes slowly with volume of base in the region around the halfway point. This is the buffer region.

Vocabulary

  • acid ionization constant
  • buffer
  • equivalence point
  • halfway point
  • pH
  • pKa
  • titration curve

About the Lesson

This lesson features an interactive titration curve for a weak acid-strong base titration.
As a result, students will have a better understanding of:

  • How acid concentration, acid ionization constant, and base concentration affect the titration.
  • The pH of a weak acid is not 7.0 at the equivalence point.
  • The pH at the halfway point is equal to the pKa of the acid.