Mistake Master

Introduction to Titration

▶︎  Watch it animatedinteractive step-through · ~3 min · optional

A titration finds an unknown concentration by adding a titrant of known concentration until the reaction is complete. The equivalence point is when the moles of titrant and analyte match the balanced equation's stoichiometric ratio; an indicator's endpoint (a color change) is used to estimate it.

UNIT 4 TOPIC 4.6 • INTRODUCTION TO TITRATION TITRATION CURVE BUILDER LAB SETUP Titrant: known concentration NaOH(aq) in buret acid analyte + indicator EQUIVALENCE POINT pH Volume of titrant added (mL) equivalence point At equivalence: moles acid reacted = moles base added For a 1:1 acid:base, n(H⁺) = n(OH⁻) the steep midpoint of the jump ENDPOINT Observable signal colorless pink indicator color changes near the equivalence point Endpoint = the observed color change. Equivalence = the exact mole relationship. A good indicator makes them nearly coincide. WHAT TITRATION MEASURES Known titrant volume × concentration reveals the unknown amount of analyte — the reaction must be specific and quantitative. AP Chemistry · Unit 4 · Chemical Reactions
In a titration, a titrant of known concentration is added to an analyte until the equivalence point — where the moles of titrant and analyte match the balanced equation's ratio. The endpoint (indicator color change) is used to estimate that point; the two are not identical.
Titration Curve Builder · Open the sandbox →

The misconceptions treat titration as simpler than it is: assuming equal volumes mean equivalence, conflating the endpoint with the true equivalence point, defaulting to a 1:1 ratio, or thinking a stronger titrant implies more analyte. The stoichiometric ratio and the moles, not volumes alone, decide equivalence.

The work

3 ways in · any order
Lesson
Titration

Titration reaches equivalence when moles match the stoichiometric ratio, estimated by the indicator endpoint. The lesson works the mole reasoning, then closes with a ten-scenario check.

Skill check · 10 scenarios
Diagnostic
10-item topic check

Ten items spanning the Topic 4.6 misconceptions: equal volumes taken as equivalence, endpoint equated with equivalence, a 1:1 ratio assumed, and a stronger titrant read as more analyte.

Not started · 10 items · ~15 min
Targeted Practice
Drill a single misconception

Pick one of the failure modes you missed and drill it on its own. The round is adaptive: two correct in a row clears the misconception and moves you to the next.

Take the diagnostic to identify your misconceptions