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One possible answer, to quote: you add colourless potassium iodide solution (or any other source of iodide ions in solution) to a solution of lead(II) nitrate, a bright yellow precipitate of lead(II) iodide is produced. More interesting, to a soluble lead ion, add chlorine bleach (NaOCl). This results in a white transient precipitate of Pb(OCl)2, which ...


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