Education Technology

Titration Curves: An Application of the Logistic Function

Published on 07/02/2009

Activity Overview

In this activity, students will use a pH sensor to record pH versus base volume data for an acid base titration. They will manually model the curve using a logistic function.

Before the Activity

The following materials are required for this activity :

  • Safety goggles
  • 50 mL or 100 mL graduated cylinder, cup or beaker
  • 25 mL household vinegar
  • 50 mL household ammonia
  • During the Activity

    Distribute the pages to your class.

    Follow the Activity procedures:

  • Place the pH sensor in a cup filled with 25 mL vinegar and set up the data collection mode
  • Add 50 mL ammonia to the cup and begin data collection
  • Observe the graph of pH versus volume of ammonia displayed by the graphing calculator
  • Compare data with a logistic function model
  • After the Activity

    Students will analyze their data and fill in the Data Collection and Analysis Sheet. They will also answer questions listed in it.

    Review student results

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary