Lesson-specific diagram for Separating ions by selective precipitation. It visualizes the reasoning sequence tied to $\text{solubility evidence}\to\text{added reagent}\to\text{precipitate}\to\text{separation}$. Text alternative: Selective precipitation is an evidence-based separation design problem requiring reagent choice, predicted solid, and a physical separation step. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.