Describe how lead(II) iodide cen be prepared in the laboratory
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https://en.wikipedia.org/wiki/Lead(II)_iodide
Lead(II) iodide (PbI2) can be prepared in the laboratory through a simple precipitation reaction involving the reaction between lead(II) nitrate (Pb(NO3)2) and potassium iodide (KI). The steps involved in the preparation of lead(II) iodide are as follows:
1. Start by wearing appropriate personal protective equipment, such as gloves and goggles, to ensure safety.
2. Prepare a solution of lead(II) nitrate (Pb(NO3)2) by dissolving a calculated amount of lead(II) nitrate salt in distilled water. Stir the solution to ensure complete dissolution.
3. Prepare a separate solution of potassium iodide (KI) by dissolving a calculated amount of potassium iodide salt in distilled water. Stir to ensure complete dissolution.
4. Slowly pour the potassium iodide solution into the lead(II) nitrate solution, while stirring continuously. As the two solutions mix, lead ions (Pb2+) and iodide ions (I-) will combine to form lead(II) iodide (PbI2), which is a yellow precipitate.
Pb(NO3)2 (aq) + 2KI (aq) → PbI2 (s) + 2KNO3 (aq)
5. After the precipitation reaction is complete, allow the mixture to sit for some time to ensure the complete formation of the yellow precipitate.
6. Filter the mixture using a filtration apparatus to separate the solid lead(II) iodide precipitate from the liquid. The yellow precipitate can be collected on the filter paper.
7. Rinse the collected precipitate with distilled water to remove any impurities or remaining soluble salts.
8. Transfer the wet precipitate onto a watch glass or a clean drying dish. Allow it to dry completely, either by air drying or using a suitable drying technique like using an oven at a low temperature.
9. Once the lead(II) iodide is completely dry, transfer it to a clean, dry, and labeled container for storage or further use.
It is important to note that handling lead compounds should be done with caution due to their toxic nature. Proper waste disposal procedures should be followed when working with lead compounds, and any remaining waste or solutions should be disposed of safely according to local regulations.