Label size

Titration Curve

Make printable titration curves for chemistry tests.

Titration

From concentrations, the pH at each volume is solved exactly from the chemistry, so a weak acid is at its pKa halfway to the equivalence point. From key points, the curve is a real titration curve bent to pass through the pH values you type.

What’s titrated Common titration 25.0 mL of 0.100 M, with 0.100 M

Acid molarity (M) Acid volume (mL) NaOH molarity (M) pKa

Equivalence point: 25 mL, pH 8.73
Half-equivalence point: 12.5 mL, pH 4.76

Marked points Equivalence: dot and lines to the axes · half-equivalence: dot and lines to the axes

Equivalence point

Its label

Half-equivalence point where pH = pKa

Its label

Curve Blue

Titles “Volume of NaOH added (mL)” · “pH”

Chart title

x-axis title

y-axis title

x-axis 0 to 50 · by 2 · numbered every 5 · no label · plain ends

From

Count by

Numbers

Label at the right end

Left end

Right end

y-axis 0 to 14 · by 1 · numbered every 2 · no label · plain ends

From

Count by

Numbers

Label at the top end

Bottom end

Top end

Grid No minor gridlines

Minor gridlines

Saved presets stay in this browser.

Acid–base titration curves

Titration Curve graphs the pH in the flask against the volume of titrant added, for a strong or weak acid titrated with NaOH, or a strong or weak base titrated with HCl. Give it the molarities, the volume in the flask and the pKa or pKb, and it solves the pH at every volume exactly, so a weak acid’s half-equivalence point lands on its pKa. Or type just the starting pH, the equivalence point’s volume and pH, and the ending pH, and it draws a real titration curve bent to pass through them.

Teachers use it for AP Chemistry and general chemistry questions on equivalence points, buffers and pKa. Mark the equivalence and half-equivalence points with a dot, with dashed lines to the axes, and with a label or a blank line for students to fill in, then set the titles, axes and gridlines to match the rest of your test.

What you can set

What’s titrated: a strong acid, weak acid, strong base or weak base
A common titration in one step: HCl, CH₃COOH, HCOOH or HF with NaOH, or NaOH or NH₃ with HCl (25.0 mL of 0.100 M, with 0.100 M)
The curve from concentrations (molarities, volume, and pKa or pKb) or from key points (starting, equivalence and ending pH)
The equivalence and half-equivalence points marked with a dot, a dot with lines to the axes, or not at all, each with a label, a blank line or nothing
The curve’s color, the chart and axis titles (or blank lines), the axis ranges and numbering, gridlines, and label size

Copying, printing and sharing

Copy the figure straight into a test, worksheet or slide, or download it as a PNG or SVG. Printing the page prints just the figure. Share link copies the page’s address with your settings in it, so anyone who opens it sees this exact figure, and presets save settings you use often in your browser. It’s free, with no sign-up.

Example figures

Weak acid–strong base titration curve
Strong acid–strong base titration curve
Weak base–strong acid titration curve
Strong base–strong acid titration curve
Titration curve worksheet: find the equivalence point

Frequently asked questions

Where is the half-equivalence point on a titration curve?

Halfway to the equivalence point’s volume. For a weak acid, the pH there equals the pKa; for a weak base, it equals 14 − pKb. The generator marks it only for weak acids and bases.

Why isn’t the equivalence point at pH 7 for a weak acid?

At the equivalence point of a weak acid with NaOH, the flask holds the acid’s conjugate base, which makes the solution basic, so the pH is above 7. For a weak base with HCl it is below 7. Only a strong acid with a strong base reaches pH 7 there.

Can I draw a curve through the pH values from a textbook or lab?

Yes. Choose Key points and type the starting pH, the equivalence point’s volume and pH, and the ending pH. The curve is the real titration that comes closest, stretched to pass through your points, and a note says if it misses one.

What’s the difference between the equivalence point and the end point?

The equivalence point is where the titrant added has exactly neutralized the analyte, in the middle of the steep part of the curve. The end point is where an indicator changes color, which should be close to it. The generator marks the equivalence point.

Can it draw polyprotic acids?

No. It draws one monoprotic acid or base titrated with a strong base or acid, so each curve has one equivalence point.

← All chemistry figures