Lesson-specific original diagram for Weak-acid/strong-base titration curves. Model: weak acid buffer basic equivalence. It supports this lesson focus: A weak-acid/strong-base curve reflects several regimes: initial weak-acid equilibrium, buffer mixture, hydrolyzing conjugate base at equivalence, and strong-base excess. Text-only equivalent: use the model statement, identify variables/species, then connect the representation to the lesson calculation and evidence check.