Titration Calculator & Lab
Simulate titrations, calculate concordant averages, and find unknown concentrations with step-by-step working.
One drop can change everything.
Add NaOH to the acid, swirling to mix.
Changing sample starts a new notebook.
Read the bottom of the meniscus
Scale increases downwards. Report readings to 2 decimal places, estimating between the 0.1 cm³ marks.
30 seconds of model observation plays in 3 seconds. Stop the tap first.
Repeat. Compare. Calculate.
Rough and overshot runs are kept for learning but excluded from the mean. Use at least two accurate endpoints whose full range is within 0.10 cm³.
| Run | Initial / cm³ | Final / cm³ | Titre / cm³ | Observation | Use |
|---|
Your first run is a rehearsal. Record it as rough, then repeat carefully.
Titration calculator
Choose a calculation. Follow the units and balanced-equation ratio through the working.
Choose the unknown and enter the known values.
Choose the unknown and enter the other three values.
Assumes the entire leftover reagent is titrated. If a question uses an aliquot, scale its moles to the full solution before using this calculator.
Fill in all values above, then press Calculate.
0 / 12 solved
No timer. Use a clue whenever you need one.
Practical guidance and how this model works
Use eye protection and follow your teacher's laboratory instructions. Rinse the burette with its titrant and the pipette with its sample; use a pipette filler. Fill the burette tip, remove bubbles and the funnel, then record the initial reading at eye level. Rinse the flask walls with distilled water as needed: this does not change the acid moles.
This virtual experiment uses HCl(aq) in the flask and NaOH(aq) in the burette, with phenolphthalein. Stop at the first faint pink tint that remains after mixing and the persistence check. A strong pink means excess alkali. A fleeting local pink patch is not the endpoint.
Indicator colour is a simplified illustration of this strong-acid/strong-base experiment, not a quantitative pH model. The visible endpoint is close to the equivalence point; they are not identical. Other titrations may need a different indicator. Drop size is fixed at 0.05 cm³ for practice; real drops and experimental errors vary. The demonstration uses a fresh virtual sample and cannot be added to your results.
The scale zoom follows the actual model reading. Full apparatus size and liquid colours are illustrative. Repeat runs use the same ideal sample, so this model does not simulate random measurement error. The concordance rule here is 0.10 cm³ across the selected group; follow any different rule given in your question.
Read the titration calculation guide · Explore the Moles Calculator
Frequently asked titration questions
How do you calculate concentration from titration results?
Calculate moles of the known solution (n = C × V), apply the molar ratio from the balanced equation to find moles of the unknown, then divide by the unknown volume (C = n / V). Always convert cm³ to dm³ first by dividing by 1000.
How do you convert mol/dm³ to g/dm³?
Multiply the molar concentration (mol/dm³) by the molar mass (Mr) of the substance. For example, 0.1 mol/dm³ NaOH (Mr = 40) = 0.1 × 40 = 4.0 g/dm³.
What are concordant titres?
Concordant titres are titre values that are within 0.10 cm³ of each other. You average only the concordant values, ignoring the rough titre and any anomalous results.