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Question
You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.
Options
potassium chloride
potassium nitride
potassium sulphide
potassium iodide
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Solution
You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of potassium iodide.
Explanation:
When lead nitrate solution is mixed with a solution of potassium iodide, a double displacement reaction takes place. The lead ions (Pb2+) combine with the iodide ions (I−) to form lead iodide (PbI2), which is highly insoluble in water and settles down as a bright yellow precipitate. The other product, potassium nitrate, remains completely dissolved and clear in the solution.
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