OpenSTEMTool / Chemistry / Chemistry
Acid–Base Titration Curve – Free Online Scientific Calculator
Plot pH while adding strong base to strong acid, including equivalence point.
Interactive & 100% Free: Enter your values directly in the calculator above or change the default inputs below to compute outputs instantly in your browser. All computations run locally for immediate privacy and high performance.
What this tool calculates
Strong acid–strong base equilibrium model. This computational model is built for university students, educators, lab researchers, and practicing engineers who need transparent, verified scientific calculations.
Calculation method and underlying formula
Ideal monoprotic strong-acid/strong-base neutralization with water autoionization; charge balance solved analytically using Kw=10^(−pKw).
The calculation evaluates relationships between input variables according to standard scientific principles. Inspect the editable parameter table below to test specific values.
Step-by-step calculation guide
- Input Parameters: Enter the required values into the parameter table below.
- Model Evaluation: The system automatically evaluates the governing equations locally with high numerical precision.
- Analyze & Export: Review the calculated outputs, inspect the generated curve plot, and download publication-ready reports or CSV data.
Worked example: default input values
The default worked example demonstrates calculation with the following parameters. You can modify any value in the interactive panel to re-evaluate your specific scenario:
| Parameter | Example value | Unit |
|---|---|---|
| Acid concentration (mol/L) | 0.1 | — |
| Acid volume (mL) | 25 | — |
| Base concentration (mol/L) | 0.1 | — |
| Maximum added base (mL) | 55 | — |
| Water pKw at selected temperature | 14 | — |
Worked example results
Based on the default parameters entered above, the model computes the following quantities:
| Calculated quantity | Output value | Unit |
|---|---|---|
| Equivalence volume | 25 | mL |
| Initial pH | 1 | — |
| pH at equivalence | 7 | — |
| Final displayed pH | 12.574 | — |
Assumptions and interpretation
- Assumes complete dissociation, ideal activities, and constant solution volume equal to summed liquid volumes.
- This implementation does NOT model weak acids, buffer equilibria, polyprotic systems, or ionic activity corrections.
Educational calculations are not substitutes for professional engineering design approvals, certified laboratory assays, clinical diagnostics, or peer-reviewed scientific publications. Always inspect units, verify physical domains, and evaluate boundary conditions.
Frequently asked questions (FAQ)
How does the Acid–Base Titration Curve calculator work?
The calculator computes results locally in your browser using the established mathematical model: Ideal monoprotic strong-acid/strong-base neutralization with water autoionization; charge balance solved analytically using Kw=10^(−pKw).
What are the input parameters for Acid–Base Titration Curve?
The required parameters include: Acid concentration (mol/L) (dimensionless), Acid volume (mL) (dimensionless), Base concentration (mol/L) (dimensionless), Maximum added base (mL) (dimensionless), Water pKw at selected temperature (dimensionless).
What assumptions apply to this Acid–Base Titration Curve model?
Assumes complete dissociation, ideal activities, and constant solution volume equal to summed liquid volumes.. This implementation does NOT model weak acids, buffer equilibria, polyprotic systems, or ionic activity corrections.
Can I export results from this calculator?
Yes. OpenSTEMTool supports exporting publication-ready SVG charts, PNG graphics, raw CSV data tables, JSON parameter archives, and printable HTML/PDF scientific reports.
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