DRAFT: This module has unpublished changes.
Methods:
- Obtain about 20mL 6 M HCl stock solution. Pipet 16.5 mL of stock solution into a 1-L volumetric flask and fill the flask to the mark. Mix the content of the volumetric flask and transfer the solution into a 1-L plastic bottle. Label the bottle properly.
- Start a new experiment on the data collection system.
- Connect the pH sensor and the Rotary Motion sensor to the data collection system.
- Set up Data Studio.
- Set up the Titrator pump.
- Rinse the syringe on the Titrator pump and set up the Titrator accessory.
- Calibrate the pH sensor.
- Add the micro stir bar to the end of the pH sensor.
- Setup the titrant container and replace the cap on the bottle, but not airtight.
- Load the syringe on the pump with the titrant solution.
- Prime the pump on the Titrator.
- Use the graduated pipet to transfer 20.00 mL of the HCl solution into a 180 mL titration jar and mount the jar on the Titration accessory over the magnetic stirrer.
- Add enough deionized water to the solution so the tip of the pH sensor is covered with solution.
- Turn on the magnetic stirrer at a steady rate.
- Start recording data.
- Press the "run" button on the Titrator to start the titration.
- Continue the titration past the equivalence point until the pH curve flattens.
- Stop recording data, and do the same for two more trials.
- Save experiment, clean the syringe on the Titrator, and clean up according to teacher's instructions.
Equipment:
- Data collection system
- pH sensor
- Drop counter and micro stir bar
- Magnetic stirrer
- Buret, 50-mL
- Graduated pipet with rubber bulb, 25-mL
- Beaker, 100-mL (2)
- Beaker, 25-mL (2)
- Clamp,right-angle
- Clamp, buret
- Ring stand
- Parafilm
- Funnel
- Hydrochloric Acid, unknown concentration, 70mL
- Sodium hydroxide (NaOH), standardized by student in previous activity, 100mL
- Buffers, pH 4 and pH 10, 10mL
- Deionized water, 100mL
- Wash bottle with deionized water
- cotton swab or tissue
DRAFT: This module has unpublished changes.
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