Acid-Base Titration Simulator
Run a full analytical titration bench: fill the burette, add titrant drop by drop or continuously, and watch the live pH meter and titration curve build as you go.
About the Acid-Base Titration Simulator
Free virtual titration lab with a real burette, flask and digital pH meter. Titrate strong or weak acids and bases, watch the pH curve build live, find the equivalence and half-equivalence points, see molecular-level views, and try the Unknown Acid Challenge. Built for chemistry labs, the acid-base titration simulator runs instantly in your browser: change a setting or drag an object and the result updates at once, so you learn by trying things out rather than only reading about them.
Run a full analytical titration bench: fill the burette, add titrant drop by drop or continuously, and watch the live pH meter and titration curve build as you go. Use it to explore chemistry labs ideas at your own pace, then check what you found against the key ideas further down this page.
How to use the Acid-Base Titration Simulator
- Use the controls to change Acid / base combination, Analyte concentration, Analyte volume in flask, Titrant concentration, Temperature, and more. The simulation reacts instantly.
- Where you see a glowing handle, object, weight or atom, drag it with your mouse or finger. Everything responds in real time.
- Watch the readouts and graphs update as you experiment, and compare what you see with the key ideas below.
Things to try
- Titrate a strong acid, then repeat with a weak acid.
- Find the equivalence volume for 0.10 M acid and 0.10 M base.
- Choose the best indicator for the weak acid and watch the warning if you pick the wrong one.
- Switch on the molecular view and watch the H3O+ and OH- dots as you approach equivalence.
- Try the Unknown Acid Challenge and calculate the concentration yourself.
Key ideas you can learn
- The equivalence point is where moles of titrant added equal moles of analyte.
- Strong acid with strong base has its equivalence point at pH 7.
- Weak acid with strong base has its equivalence point above pH 7 and a buffer region before it, centred on the half-equivalence point where pH = pKa.
- Weak base with strong acid has its equivalence point below pH 7.
- The indicator's colour-change range must bracket the equivalence pH, or the colour change will not mark the true endpoint.
Where this is used in the real world
Titration is used in water testing, food labs, medicine and industry to find unknown concentrations accurately. Pharmacies and quality-control labs run titrations every day.
Who is this simulation for?
Students preparing for practical exams and teachers who want a virtual lab. You can repeat the experiment without chemicals, waste or safety risks.
For teachers: project it on the board, let students predict what will happen, then run it together. For students: change one thing at a time and write down what changes.
Frequently asked questions
What is the equivalence point?
The point in a titration where the amount of titrant added exactly reacts with the analyte. It shows as the steepest part of the pH curve and as a sharp peak on the derivative graph.
Which indicator should I use?
Choose an indicator whose colour-change range includes the pH at the equivalence point. Phenolphthalein suits weak acid with strong base; methyl orange suits weak base with strong acid.
What is the half-equivalence point?
The point where exactly half the analyte has reacted. For a weak acid or base, the pH there equals the pKa (or 14 − pKb), by the Henderson-Hasselbalch equation.
Is the Acid-Base Titration Simulator free to use?
Yes. It is completely free, with no signup, no download and no ads inside the simulation. It runs in your web browser.
Does the Acid-Base Titration Simulator work on a phone or tablet?
Yes. It uses touch as well as the mouse, so you can drag objects with your finger. A larger screen makes the controls easier to see.