Acid-Base Titration Experiment Instruction Sheet
Introduction: Acid-Base Titration Experiment is a method of determining the unknown concentration of a solution by introducing a known concentration of a solution of known volume. In this experiment, you will perform an acid-base titration to determine the concentration of an unknown acid solution.
- Unknown acid solution
- 0.1 M NaOH solution (standard solution)
- Indicator solution (e.g. phenolphthalein)
- Beaker or flask
- Stirring rod
- Obtain a clean, dry burette and fill it with the 0.1 M NaOH solution. Record the initial burette reading.
- Obtain a clean, dry 250-mL beaker or flask and add approximately 50 mL of the unknown acid solution to it.
- Add a few drops of indicator solution (e.g. phenolphthalein) to the acid solution and stir.
- Slowly add the NaOH solution from the burette to the acid solution while stirring, until the solution changes color (indicating the endpoint of the titration). Record the final burette reading.
- Repeat the titration at least 2 more times and calculate the average volume of NaOH solution used.
- Use the balanced equation for the acid-base reaction and the volume and concentration of the NaOH solution to determine the concentration of the unknown acid solution.
- Be sure to wear gloves and goggles during the experiment.
- Be sure to use clean, dry equipment and solutions.
- Do not ingest any of the solutions used in the experiment.
- Take care when handling the burette and pipette as they contain chemicals that can cause injury if spilled or broken.
You should also go through the IB DP chemistry IA section here.