Lesson-specific original diagram for Ksp and molar solubility for 1:1 salts. Model: K sp =s 2. It supports this lesson focus: For a simple 1:1 salt in pure water, each ion concentration equals molar solubility s, making Ksp equal to s squared. Text-only equivalent: use the model statement, identify variables/species, then connect the representation to the lesson calculation and evidence check.