🧪 Acid–base titration: virtual chemistry experiment
Find the end-point of HCl vs NaOH with phenolphthalein and plot the titration curve.
▶ Launch this experiment freeRuns in your browser on any phone, tablet or laptop. No sign-up, no install, no chemicals needed.
What you'll do
- Add 1 mL of phenolphthalein to the flask (drag it from Liquids)
- Select the burette and open the stopcock
- Watch the pH curve; the colour turns pink at the end-point (~25 mL)
- Close the stopcock and read the volume delivered
The chemistry behind it
HCl + NaOH → NaCl + H₂O. At the equivalence point moles of OH⁻ equal moles of H⁺. The pH jumps steeply from about 4 to 10 within a fraction of a millilitre, so one drop turns phenolphthalein pink.
Why do this experiment virtually?
Many school labs can't run this experiment safely or don't have the chemicals. In Faradium you set it up in seconds, repeat it as often as you like, change the amounts and see the real result: colours, gases, precipitates and temperature changes. The lab notebook records every observation with the balanced equation for your write-up.
Frequently asked questions
How do you do the acid–base titration experiment?
1. Add 1 mL of phenolphthalein to the flask (drag it from Liquids) 2. Select the burette and open the stopcock 3. Watch the pH curve; the colour turns pink at the end-point (~25 mL) 4. Close the stopcock and read the volume delivered You can run every step free in the Faradium virtual chemistry lab.
What is the chemistry behind acid–base titration?
HCl + NaOH → NaCl + H₂O. At the equivalence point moles of OH⁻ equal moles of H⁺. The pH jumps steeply from about 4 to 10 within a fraction of a millilitre, so one drop turns phenolphthalein pink.
Can I do the acid–base titration experiment online for free?
Yes. Faradium sets up the bench for you and ticks off each step as you complete it. It runs in any browser on a phone, tablet or laptop with no sign-up and no chemicals.
Chemistry in this experiment
Elements involved: Hydrogen (H), Oxygen (O), Sodium (Na), Chlorine (Cl).
More experiments to try
✨ Golden rain
Make lead(II) iodide, dissolve it hot, then watch glittering golden crystals form on cooling.
🐘 Elephant's toothpaste
Iodide-catalysed decomposition of 30% hydrogen peroxide produces a towering, steaming foam.
🔥 Preparing oxygen
Heat potassium permanganate, pipe the gas into a gas jar and confirm with a glowing splint.
🫧 CO₂ and limewater
Marble + acid makes CO₂. Bubble it through limewater: milky, then clear again in excess.