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