Experiment 10 - Acid-Base Titrimetry

Procedure:

Part C - Titration of an Unknown Na₂CO₃ Sample

1. Obtain about 100 mL of the sample provided in a clean and dry beaker.
2. Pipet 25.00 mL of the sample into a clean Erlenmeyer flask. Add 5 drops of bromocresol green indicator.
3. Titrate the sample with the standardized HCl solution to a green endpoint from blue as before. Record the buret volume. The volume of the titrant should be more than 10 mL but less than 50 mL. If the volume falls outside this range, use a different size of sample for titration.
4. Repeat steps 2 and 3 until two titration volumes are obtained which agree to within +/- 0.10 mL.