Activity Overview
In this activity, students' will use a Voltage Sensor to measure the voltage produced by an electrolyte. They will understand that acids and bases are electrolytes and compare voltages of acids to the voltages of bases. Students' will test liquid and determine if they are acids, neutrals, or bases.
Before the Activity
Connect the TI-73 Explorer™ to the CBL™ unit
Connect the voltage sensor to Channel 1 in the CBL™ unit
Download DataMate™ program
See the attached PDF file for detailed instructions for this activity
Print pages 41 - 46 from the attached PDF file for your class
During the Activity
Distribute the pages to your class.
Complete the Hypothesis section on the Data Collection and Analysis page and based on the pH value predict which acid and base will produce the highest voltage
Follow the Activity procedures:
Put the test liquid in a container
Place the electrodes in the liquid
Attach the black and red leads to the electrodes
Measure the voltage of the electrolyte
Measure the voltage for the other sample liquids
Repeat the activity using different combiations of electrodes
Identify the liquid that produced the highest voltage
After the Activity
Students' will complete Student Data Collection and Analysis Sheet.
Review student results
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary