[titration-curve] Acid-Base Titration Curve

[MarkusNeusinger]

Description

A titration curve showing pH vs volume of titrant added, with the equivalence point clearly marked. The S-shaped curve reveals buffer regions, equivalence points, and acid/base strength. Essential for analytical chemistry labs and education.

Applications

• Determining the concentration of an unknown acid or base solution
• Identifying the equivalence point and selecting appropriate indicators
• Teaching acid-base equilibrium concepts in chemistry courses
• Quality control in pharmaceutical and food industry

Data

• volume_ml (numeric) — volume of titrant added in mL
• ph (numeric) — measured pH value at each volume
• Size: 50-200 data points

Notes

• Mark equivalence point with vertical dashed line and annotation
• Show derivative curve (dpH/dV) as optional overlay to pinpoint equivalence
• Include buffer region shading
• Use realistic data for strong acid/strong base titration (e.g., HCl + NaOH)

[claude]

✅ Spec ID: titration-curve

Rationale: Follows the established curve naming pattern (like calibration-curve, elbow-curve) for this classic chemistry visualization showing pH vs. titrant volume with equivalence point marking.

This is a valid and useful plot type — titration curves are fundamental in analytical chemistry education and lab work. No existing spec covers this visualization.

[github-actions]

✅ Specification Ready: titration-curve

PR: #4433

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specification.md

titration-curve: Acid-Base Titration Curve

Description

A titration curve plotting pH against volume of titrant added, producing the characteristic S-shaped (sigmoidal) curve used in analytical chemistry. The plot reveals buffer regions, equivalence points, and acid/base strength at a glance. Essential for chemistry education and laboratory analysis, it helps identify when a reaction reaches completion and which indicators are appropriate.

Applications

• Determining the concentration of an unknown acid or base solution through volumetric analysis
• Identifying the equivalence point and selecting appropriate pH indicators for endpoint detection
• Teaching acid-base equilibrium, buffer capacity, and neutralization concepts in chemistry courses
• Quality control analysis in pharmaceutical manufacturing and food industry processes

Data

• volume_ml (numeric) — volume of titrant added in mL, ranging from 0 to beyond the equivalence point
• ph (numeric) — measured pH value at each volume increment
• Size: 50-200 data points for a smooth curve
• Example: Strong acid/strong base titration (e.g., 25 mL of 0.1 M HCl titrated with 0.1 M NaOH)

Notes

• Mark the equivalence point with a vertical dashed line and text annotation showing the volume and pH
• Include an optional derivative curve (dpH/dV) as a secondary y-axis overlay to precisely locate the equivalence point as the maximum of the derivative
• Shade the buffer region (typically the area around pH = pKa ± 1 for weak acid/base titrations) with a semi-transparent fill
• Use realistic titration data for a strong acid/strong base system (e.g., HCl + NaOH) where the equivalence point occurs at pH 7
• Label axes clearly: "Volume of NaOH added (mL)" on x-axis and "pH" on y-axis
• The y-axis should span pH 0-14 to show the full pH scale

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Next: Add approved label to merge this specification to main.

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🤖 spec-create workflow

[github-actions]

🚀 Specification Merged!

Specification: titration-curve
PR: #4433 (merged)

The specification is now in main and synced to PostgreSQL.

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Next: Add generate:{library} labels to start generating implementations.

Available libraries: matplotlib, seaborn, plotly, bokeh, altair, plotnine, pygal, highcharts, letsplot

Or use workflow dispatch for bulk operations.

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🤖 spec-create workflow