How do I read a titration curve?

Start by reading the initial pH on the left of the graph. The flat buffer region rises gradually until the steep S-shaped inflection, which marks the equivalence point. The midpoint of the buffer region is the half-equivalence point, where pH equals pKa. After the equivalence point the pH levels off as excess titrant is added.

Is the titration curve generator free?

Yes. You can generate titration curves on the free credits every account starts with. Buying any pay-as-you-go credit pack removes the watermark and unlocks higher resolutions. Credits never expire.

What is the equivalence point on a titration curve?

The equivalence point is the exact moment during a titration when the moles of acid equal the moles of base added. On the curve it appears as the midpoint of the steepest S-shaped section. For a strong acid with a strong base the equivalence point is at pH 7; for a weak acid with a strong base it is above pH 7.

What is the difference between a weak acid and a strong acid titration curve?

A strong acid curve starts at a very low pH and has a steep S-shaped inflection at pH 7. A weak acid curve starts at a higher initial pH, shows a visible flat buffer region with a half-equivalence point, and reaches its equivalence point above pH 7. The buffer region is absent in strong acid curves because there is no conjugate acid-base pair to resist pH changes.

Can I use the titration curve generator for chemistry class?

Yes. Download a high-resolution PNG (up to 4K) for lab reports, slides, and study guides. The tool covers strong acid, weak acid, strong base, weak base, and polyprotic acid systems, making it practical for high school AP Chemistry and university general chemistry coursework. Always verify key values against your textbook before submitting for assessment.

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Titration Curve Generator Titration Curves

Describe an acid-base titration and get a clean, labeled pH titration curve in seconds, with the equivalence point, half-equivalence point, and buffer region clearly marked. Strong acid, weak acid, polyprotic, and more.

Last updated: 2026-06-21

✓Strong & weak acid curves✓Equivalence point labeled✓Buffer region highlighted✓Slide & print ready

Titration Curve Generator

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Titration Curve Examples

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Strong Acid + Strong Base Titration

Classic S-shaped curve for HCl titrated with NaOH, with the equivalence point labeled at pH 7.

chemistrystrong acidstrong base

Weak Acid + Strong Base (Buffer Region)

Acetic acid titrated with NaOH, highlighting the flat buffer region and half-equivalence point where pH equals pKa.

chemistryweak acidbuffer region

Strong Acid + Weak Base Titration

HCl titrated with ammonia, with the equivalence point below pH 7 due to the acidic nature of the conjugate acid.

chemistryweak basestrong acid

Equivalence & Half-Equivalence Points Labeled

A weak acid titration curve with both the equivalence point and half-equivalence point annotated with dashed lines and pH values.

chemistryequivalence pointhalf-equivalence

Polyprotic Acid Titration (Two Equivalence Points)

A diprotic acid (such as carbonic acid) titration curve with two S-shaped inflections and two equivalence points.

chemistrypolyproticdiprotic

Titration Curve with Indicator Range Marked

Titration curve showing a shaded band for the indicator color-change range (e.g. phenolphthalein, pH 8.2-10) near the equivalence point.

chemistryindicatorphenolphthalein

What is a titration curve?

A titration curve is a graph that tracks how the pH of a solution changes as a titrant is added during an acid-base titration. The x-axis shows the volume of titrant added (in milliliters) and the y-axis shows the resulting pH. The curve typically displays a characteristic S-shape with a steep inflection at the equivalence point, where the moles of acid exactly equal the moles of base. Figviz generates a clean, labeled titration curve from a plain description of your acid-base system, saving you from drawing and annotating by hand.

How to read and make a titration curve

Identify the starting pH: for a strong acid this is very low (near 0-2); for a weak acid it is higher due to partial dissociation.

Locate the buffer region: the flat portion of the curve where pH changes slowly as titrant is added, centered around the half-equivalence point.

Find the half-equivalence point: the volume midpoint before the equivalence point, where pH equals the pKa of the weak acid.

Identify the equivalence point: the steepest part of the S-curve; pH 7 for strong-acid/strong-base, above 7 for weak-acid/strong-base, below 7 for strong-acid/weak-base.

Read the final pH: after the equivalence point the pH levels off as excess base dominates.

Describe your system in Figviz, pick a style, and generate a labeled graph ready for slides or print.

Key features of a titration curve

Equivalence point: where moles of acid equal moles of base; shown by the inflection of the steep S-shaped section.

Buffer region: the relatively flat zone before the equivalence point where the weak acid and its conjugate base coexist and resist pH changes.

Half-equivalence point: midway through the buffer region; pH equals pKa here, making it useful for determining acid strength.

Indicator range: a pH indicator changes color over a narrow range; for accurate results the range should bracket the equivalence point.

Polyprotic acids show multiple S-shaped inflections, one for each ionizable proton, so two equivalence points appear for a diprotic acid.

Tips for accurate titration curve diagrams

State the acid and base clearly and specify whether each is strong or weak. For weak acids, include the pKa if you know it so the half-equivalence point can be placed accurately. For polyprotic acids, mention the number of ionizable protons so all equivalence points appear. If you need an indicator range shown, name the indicator (for example phenolphthalein, pH 8.2-10, or methyl orange, pH 3.1-4.4). Always cross-check that the equivalence point pH matches your expected value before using the diagram for coursework.

Frequently asked questions

A titration curve generator is a tool that draws a pH vs. volume graph for an acid-base titration. With Figviz you describe the acid and base involved, and the AI produces a clean, labeled S-shaped curve with the equivalence point, buffer region, and other features annotated, in seconds.

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