Lesson Plan

• Describe the process of preparing an insoluble salt by precipitation.
• Write balanced molecular, complete ionic and net ionic equations for precipitation reactions.
• Apply solubility rules to predict which product will be insoluble.
• Carry out the laboratory steps: mixing solutions, filtration, washing and drying of the precipitate.
• Evaluate how concentration, temperature and common‑ion effect influence precipitate yield.

• 0.1 M solutions of BaCl₂, Na₂SO₄, AgNO₃, NaCl (or equivalent)
• Beakers, stirring rods
• Filter funnel and filter paper
• Drying oven or air‑drying rack
• Safety goggles and gloves
• Projector/whiteboard for equations
• Worksheet with practice reactions

Begin with a quick demonstration of a white precipitate forming when two clear solutions are mixed, asking students what they observed. Review the solubility rules they have already learned and explain that today they will use those rules to predict and isolate insoluble salts. Success will be measured by their ability to write correct net ionic equations and safely carry out the filtration procedure.

1. Do‑now (5'): Students list the key solubility rules on a sticky note.
2. Mini‑lecture (10'): Explain precipitation reactions, show how to write molecular, complete ionic and net ionic equations.
3. Demonstration (15'): Prepare barium sulphate precipitate, highlight filtration and washing steps while discussing observations.
4. Guided practice (10'): In pairs, students write equations and predict the precipitate for two new reactions.
5. Laboratory activity (20'): Students conduct a silver chloride precipitation, then filter, wash and dry the solid.
6. Check for understanding (5'): Quick exit quiz – match reactions to their net ionic equations.
7. Reflection (5'): Discuss how concentration, temperature and common‑ion effect altered the amount of precipitate.

Recap the step‑by‑step procedure and the importance of solubility rules in predicting precipitates. Students complete an exit ticket by writing the net ionic equation for a given reaction and noting one factor that could improve yield. For homework, they research a real‑world application of an insoluble salt (e.g., medical imaging, water treatment) and prepare a short summary.