Lesson-specific original diagram for Water autoionization and Kw. Model: K w=[H 3O +][OH -]. It supports this lesson focus: Water is an equilibrium system; at 25 °C the standard classroom model uses $K_w=1.0	imes10^{-14}$. Text-only equivalent: use the model statement, identify variables/species, then connect the representation to the lesson calculation and evidence check.