Strong Acid Titration Lab: Add Base and Track pH
Titrate a strong monoprotic acid with a strong base at 25 °C. Compare excess amounts, pH, and the equivalence volume.
Free, with no sign-up.
For High school students and adults reviewing the topic.
About 8 minutes.
How does it work?
- Change a control to update the table and diagram.
- Open a preset to compare settings, then try the challenges.
What will you get?
Compare the model’s outputs, explore its presets, and check two challenges.
What does the model assume?
- The acid supplies one proton per molecule and the base supplies one hydroxide ion per formula unit. Both dissociate completely.
- The temperature is fixed at 25 °C, and Kw = 1.0 × 10⁻¹⁴. Water dissociation is included even in dilute mixtures.
- Volumes add. Concentrations approximate activities; the model neglects activity corrections and heat released during mixing.
- Neutralization is one-to-one. Equivalence means equal amounts in moles, and the pH there is 7 under these assumptions.
- This is a mathematical model, not a procedure for handling chemicals.
Which setup would you like to try?
What can you change?
Range: 0.000001 to 1 mol/L.
Range: 10 to 100 mL.
Range: 0.000001 to 1 mol/L.
Range: 0 to 200 mL.
What does the model predict?
| Quantity | Value | Unit |
|---|---|---|
| Initial acid amount | 0.002500000 | mol |
| Base added | 0.001000000 | mol |
| Excess reagent | Acid | |
| pH | 1.368 | |
| Base volume at equivalence | 25.000 | mL |
Solid line: pH. Circle: current mixture. Square: equivalence.
The current mixture has pH 1.368 at 10 mL added. Equivalence is at 25 mL and pH 7.
Can you reach these targets?
Keep 25 mL of 0.100 mol/L acid and use 0.100 mol/L base. Add enough base to reach pH 7.
- Target: Acid volume = 25 mL; tolerance 0 mL.
- Target: Acid concentration = 0.1 mol/L; tolerance 0 mol/L.
- Target: Base concentration = 0.1 mol/L; tolerance 0 mol/L.
- Target: pH = 7 ; tolerance 0.01 .
Keep the same acid and base concentrations and 25 mL of acid. Find a base volume that gives pH 12.52, within 0.02.
- Target: Acid volume = 25 mL; tolerance 0 mL.
- Target: Acid concentration = 0.1 mol/L; tolerance 0 mol/L.
- Target: Base concentration = 0.1 mol/L; tolerance 0 mol/L.
- Target: pH = 12.52 ; tolerance 0.02 .