What method is used to prepare lead iodide which is an insoluble salt
Write an ionic equation for the reaction in the preparation of lead (2)iodide salt,including state symbols
The equation for the preparation of lead (2) iodide salt is:
Pb(NO3)2 (aq) + 2KI (aq) → PbI2 (s) + 2KNO3 (aq)
Where:
Pb(NO3)2 (aq) is lead (2) nitrate in aqueous solution
2KI (aq) is potassium iodide in aqueous solution
PbI2 (s) is lead (2) iodide, the insoluble salt
2KNO3 (aq) is potassium nitrate in aqueous solution
The ionic equation for this reaction is:
Pb2+ (aq) + 2NO3- (aq) + 2K+ (aq) + 2I- (aq) → PbI2 (s) + 2K+ (aq) + 2NO3- (aq)
Where:
Pb2+ is lead (2) ion, which is the cation in lead (2) nitrate
NO3- is nitrate ion, which is the anion in lead (2) nitrate and potassium nitrate
K+ is potassium ion, which is the cation in potassium iodide and potassium nitrate
I- is iodide ion, which is the anion in potassium iodide
Note that the potassium ions and nitrate ions are spectators in the reaction, meaning they are present before and after the reaction and do not participate in the formation of the insoluble salt.
The method commonly used to prepare lead iodide, which is an insoluble salt, is precipitation. Here is a step-by-step guide:
1. Start by pouring a solution of lead nitrate (Pb(NO3)2) into a beaker. This will act as the source of lead ions.
2. In a separate container, mix a solution of sodium iodide (NaI). This will provide iodide ions.
3. Slowly pour the sodium iodide solution into the beaker containing the lead nitrate solution, while stirring continuously.
4. As the two solutions mix, a reaction occurs between the lead ions and iodide ions, resulting in the formation of lead iodide (PbI2), which is a yellow precipitate. The balanced chemical equation for this reaction is:
Pb(NO3)2 + 2NaI -> PbI2 + 2NaNO3
5. Continue stirring the mixture to ensure complete reaction and precipitation of all the lead iodide.
6. Once the precipitation is complete, allow the mixture to settle for a few minutes.
7. Collect the yellow precipitate of lead iodide by filtration. Use a filter paper and a filter funnel to separate the solid precipitate from the liquid. The liquid that passes through the filter paper is called the filtrate.
8. Rinse the collected precipitate with distilled water to remove any impurities or remaining soluble salts.
9. Transfer the wet lead iodide precipitate onto a watch glass or a clean dry container.
10. Finally, leave the lead iodide to dry completely, either by air drying or by gently heating it using a Bunsen burner or an oven. Make sure not to overheat the lead iodide, as it can decompose at high temperatures.
Following these steps will allow you to prepare lead iodide, an insoluble salt, through precipitation.
To prepare lead iodide, which is an insoluble salt, the process of precipitation is commonly used. Here's how you can prepare lead iodide using the method of precipitation:
1. Start with two soluble salts that contain the desired ions: lead(II) ions (Pb²⁺) and iodide ions (I⁻). For example, you can use lead nitrate (Pb(NO₃)₂) and potassium iodide (KI) as the starting materials.
2. In a beaker or reaction vessel, dissolve the lead nitrate in distilled water to form a clear solution.
3. In a separate beaker, dissolve the potassium iodide in distilled water to form another clear solution.
4. Carefully pour the potassium iodide solution into the lead nitrate solution. As the two solutions mix, lead iodide (PbI₂) will precipitate out as a yellow solid.
5. Stir the mixture gently to aid in the precipitation process. Make sure the precipitate is evenly distributed throughout the mixture.
6. Allow the mixture to sit undisturbed for some time, usually a few minutes or more. This will ensure complete precipitation of the lead iodide.
7. Once the precipitation is complete, use a vacuum filtration setup to separate the solid lead iodide from the liquid. Alternatively, you can use a filter paper or funnel to accomplish this.
8. Wash the collected lead iodide with distilled water to remove any impurities or soluble byproducts. This will help purify the final product.
9. After washing, allow the lead iodide to dry completely. You can use an oven, desiccator, or simply let it air dry, depending on the desired speed and conditions.
10. Finally, collect and store the dried lead iodide in a properly labeled container, keeping it away from moisture and light to prevent any decomposition.
By following these steps, you will obtain lead iodide, which is an insoluble salt.