Virtual Titration Simulator

Instructions

Choose an analyte, a titrant and an indicator. Open the stopcock, watch the pH curve grow, and find the equivalence point and the pKa from your own data.

  1. Choose an analyte, titrant, and indicator.
  2. Add titrant with the stopcock while watching the solution and pH curve.
  3. Find the equivalence point and, for a weak acid or base, use the curve to investigate pKa.

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25 °C, monoprotic acids and bases. One drop is 0.05 mL.

2. Titrate

The bench

Burette over a flask with a pH probe
pH
Titrant added
Burette reading
Solution color

Stopcock

3. Watch the curve

pH curve

Go drop by drop near the steep part to see it clearly. The shaded band is where the indicator changes color.

4. Analyze

Find the key points

The endpoint

When the indicator changes color and the color stays, record the endpoint.

No endpoint recorded yet.

From your curve

5. Make sense of it

What does the curve tell you?

Try a strong acid, then a weak acid, with the same base. Then switch indicators and record the endpoint again.

Why is the curve steepest at the equivalence point? Why does the pH at the half-equivalence point equal the pKa? Which indicator worked, and why?

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About this activity

Titrate strong and weak acids and bases with a virtual burette, pH meter and indicators. Read the pH curve to find the equivalence point and the pKa.

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