Free · Private · Chemistry Lab
Titration Simulator
Practice acid–base, redox, and complexometric titrations with live curves, first-derivative Veq detection, indicator color, and CSV export — built for students, teachers, and working chemists.
Main · simulator
Titration curve
Veq
25.00mL
pH now
2.88
Progress
0% Veq
Sub · color
Phenolphthalein
pKa ≈ 9.4
Sub · experiment setup
Choose chemistry & concentrations
Buffer region appears before equivalence; endpoint is basic — phenolphthalein is the classic choice.
A practical virtual titration lab
Whether you are learning buffer regions for the first time or scouting endpoint sharpness before a wet-lab method, this titration curve calculator mirrors the numbers you write in a lab notebook: analyte volume, molarities, Ka/Kb or E°, and indicator choice. Pair it with the Chemical Equation Balancer when you need the balanced reaction first.
Start from common lab cases — strong/strong, weak acid/strong base, redox, and EDTA hardness — then tweak concentrations.
Watch pH, potential, or pM evolve as you add titrant, and switch to the first-derivative plot to pin Veq.
See how phenolphthalein, methyl orange, and other indicators would appear around the endpoint.
Scrub volume with a slider, animate the burette drip, export CSV, and copy a short results summary.
How to use the titration simulator
- 1
Choose a preset or titration type
Pick Acid–Base, Redox, or Complexometric, or load a ready-made classroom experiment.
- 2
Set concentrations and volume
Enter analyte molarity, analyte volume (mL), and titrant molarity — the same numbers you would use at the bench.
- 3
Run and find Veq
Press Start to animate, or drag the volume slider. Read equivalence volume and compare with the derivative peak.
- 4
Export for your report
Copy CSV points or the text summary into your lab notebook or spreadsheet.
Frequently asked questions
What is an equivalence point?
The equivalence point is where the moles of titrant added exactly match the moles of analyte according to the reaction stoichiometry. On a pH curve it sits in the steepest region; on a first-derivative plot it is the peak.
How do I choose an indicator?
Pick an indicator whose color-change range overlaps the steep part of your titration curve. Phenolphthalein (≈8.2–10) suits many weak-acid/strong-base titrations; methyl orange suits strong-acid/strong-base or strong-acid/weak-base cases.
Why is the weak-acid curve flatter at the start?
That is the buffer region. As strong base converts weak acid into its conjugate base, the Henderson–Hasselbalch relationship keeps pH from rising quickly until near equivalence.
What does the derivative plot show?
The first derivative (ΔpH/ΔV or ΔE/ΔV) peaks where the curve is steepest — a practical way to locate the equivalence volume for lab reports and endpoint analysis.
Can I use this for homework and lab reports?
Yes. Set concentrations and volumes like your experiment, note Veq and the y-value at equivalence, export CSV for graphs in Excel/Sheets, and copy the brief report text.
Is this a full activity-coefficient model?
No — it is an instructional / planning simulator using common textbook approximations (strong/weak acid–base regions, Nernst-style redox progress, and pM for EDTA-style complexometry). Ideal for learning and scouting conditions before the wet lab.
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