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Question
(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
(ii) What type of reaction is this?
(iii) Write a balanced chemical equation to represent the above reaction.
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Solution
i) When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed along with lead iodide.
(ii) This is a double displacement reaction.
(iii) The balanced chemical equation for the above reaction is:
2KI(aq) + Pb(NO3)2(aq) —→ 2KNO3(aq) + PbI2(s)↓
Potassium Lead Potassium Lead
iodide nitrate nitrate iodide
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