A student prepared lead(II) iodide by mixing lead(II) nitrate solution with potassium iodide solution. The yellow precipitate was filtered, washed and dried. Why was the precipitate washed with distilled water?

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Question

A student prepared lead(II) iodide by mixing lead(II) nitrate solution with potassium iodide solution. The yellow precipitate was filtered, washed and dried. Why was the precipitate washed with distilled water?

Accepted Answer

To remove soluble impurities such as potassium nitrate — Award 1 mark for identifying that washing removes soluble impurities. Potassium nitrate (the other product) and any excess reactants are soluble and must be washed away. B is incorrect — while this may occur, the main purpose is to remove the soluble product KNO₃. D is incorrect — lead(II) iodide is insoluble and will not dissolve. A is incorrect — washing does not chemically change the compound.

Answer

To dissolve any unreacted lead(II) nitrate

Answer

To convert the lead(II) iodide into a purer form

Answer

To remove soluble impurities such as potassium nitrate

Answer

To make the lead(II) iodide dissolve faster

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