Determination of pKa of Acetic Acid by pH Titration Method

Step 1: Calibration of the pH Meter

1. Switch on the pH meter.
2. Press the Calibrate button to perform calibration.
3. Ensure that the pH meter is properly calibrated before proceeding.

Step 2: Measurement of Initial pH of Acetic Acid

1. Place the pH electrode into the beaker containing the acetic acid solution.
2. Press the Check button on the pH meter.
3. Record the initial pH value of acetic acid.

Step 3: Titration with Sodium Hydroxide (NaOH)

1. Open the burette valve to add 2 mL of NaOH solution into the beaker.
2. Switch on the magnetic stirrer by clicking the red button.
3. Allow proper mixing and record the new pH reading.

Step 4: Incremental Addition of NaOH and pH Recording

1. Again, add 2 mL of NaOH into the beaker using the burette valve.
2. Allow the solution to mix properly using the magnetic stirrer.
3. Record the new pH value.
4. Repeat the incremental addition of 2 mL NaOH each time.
5. Continue the process and record pH values for a total of 25 additions.

Step 5: Calculation of pKa Value

1. After completing all titration steps, click on Next Step.
2. Use the recorded pH values and corresponding NaOH volumes to calculate the pKa value of acetic acid.