PASCO CI-6729 (1X) CONDUCTIVITY SENSOR - Manual (Page 21)

17
012–06485B Conductivity Sensor
Experiment 4: Acid-Base Titration with the Conductivity Senso
Purpose
The purpose of this experiment is to explore the electrical transport processes of an acid-base
titration. In addition, this experiment will explore the possibility of using a Conductivity Sensor
to find the equivalence point.
Materials and Equipment Needed
• Conductivity Sensor • 10 ml pipette
• Science Workshop version 2.2.5 or higher • distilled or deionized H
2
O
• Temperature Senor Teflon FEP cover • was bottle of distilled or deionized H
2
O
• PASCO computer interface • 250 ml beaker (2)
• computer • magnetic stirrer & spin bar
• 100 ml graduated cylinder • 0.03 M hydrochloric acid (HCl)
• buret and buret clamps (2) • 0.5 M sodium hydroxide (NaOH)
• Conductivity Sensor manual • buffer solutions: low pH (4) and high pH (10)
• apron, gloves, and goggles
Optional Materials
• 0.03 M acetic acid
Procedure
1. Soak the conductivity electrode in distilled or deionized H
2
O for 5–10 minutes.
2. Set up the Conductivity Sensor according to the procedure detailed in pages 6–7 of the
manual. Select the 20k scale on the amplifier box. (Calibration is not needed for this
experiment.)
3. In the Experiment Setup window, click Sampling Options , and select the Keyboard
check box In the Parameter box, type Volume, and in the Units box, type ml.
4. Click the Graph Display for the Conductivity Sensor. Click the Horizontal Axis Input
button, and select Volume (ml).
5. Use a graduated cylinder to measure 150 ml of 0.03 M HCl solution in a clean dry 250 ml
beaker.
6. Carefully put the spin bar into the beaker. Place the beaker with the 0.03 M HCl solution
and spin bar on the magnetic stirrer. Add a few drops of indicator into the 0.03 M HCl
solution.
7. Use a buret clamp and the base and support rod to position the conductivity electrode so the
cell is in the 0.03 M HCl solution, but will not interfere with the spin bar.