Acid-Base Titration Simulator
Add base drop by drop and watch the pH curve and indicator colour change.
About the Acid-Base Titration Simulator
Free virtual titration lab. Titrate a strong or weak acid with a strong base, watch the pH curve, find the equivalence point and see the indicator change colour. 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.
Add base drop by drop and watch the pH curve and indicator colour change. 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 (25 mL in flask), Acid concentration, NaOH concentration, Indicator, Base added. The simulation reacts instantly.
- Press "+ Drop", "+ 0.5 mL", "+ 2 mL", "Reset" to start, reset or change what is happening.
- 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.
- Double the acid concentration and see the curve move.
Key ideas you can learn
- The equivalence point is where moles of base added equal moles of acid.
- 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.
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 base added exactly neutralises the acid. It shows as the steepest part of the pH curve.
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.
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.