Joseph Dias
Pre-Lab #7
10/12/25
Simplified Procedure
Part A: Known Acid Concentration
1. Set up the buret and fill it with 0.10 M NaOH.
2. Measure 10.0 mL of 0.10 M HCl into a flask.
3. Add 3 drops of phenolphthalein.
4. Slowly add NaOH while swirling until a faint pink color appears.
5. Record the volume of NaOH used.
6. Repeat three times and record results.
Part B: Unknown Acid Concentration
1. Use the same setup.
2. Fill the buret with 0.10 M NaOH.
3. Measure 10.0 mL of unknown HCl into a flask.
4. Add 3 drops of phenolphthalein.
5. Titrate until a faint pink color stays.
6. Record the NaOH volume used.
Safety:
Wear goggles and handle all chemicals carefully.