AP Chemistry Titration Curves Explained (With Free Simulator)

Why titration curves matter on AP Chemistry

College Board loves titration FRQs: you must map pH vs volume, spot the equivalence point, and reason about buffer regions. A clean mental model beats memorizing every shape.

The four shapes you must know

1. Strong acid + strong base — steep jump through pH 7 at equivalence.
2. Weak acid + strong base — buffer region before equivalence; equivalence pH > 7.
3. Weak base + strong acid — buffer region; equivalence pH < 7.
4. Polyprotic — multiple equivalence points (watch stoichiometry carefully).

Half-equivalence is your friend

For a monoprotic weak acid, at half-equivalence pH = pK_a. That single fact unlocks many free-response points.

Practice with the free lab

Open the interactive Titration Curve Simulator on TheChemSolver — free for 15 days, then $15/year for full access. Drag titrant volume and watch the curve update in real time.

Exam tip

Always label axes, mark equivalence, and write one sentence about what species dominate before and after equivalence. Graders reward clear chemistry language.