Edexcel CC8g Solubility. This powerpoint starts with a demo of lead nitrate and potassium iodide reacting together to give a bright yellow precipitate. I try and and make this a bit of a magic show! This then leads on to looking at the solubility rules and deciding which salts are soluble or not. After some practice of finding the precipitate, the students are then shown how to make an insoluble salt. The lesson finishes with an exit ticket which could be handed in so that the teacher can find out what students are still unsure of.