What is observed when potassium iodide is added to aqueous lead nitrate identify the type of reaction give a balanced chemical equation for this?

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Text Solution

Solution : On mixing, two colourless solutions of lead nitrate and potassium iodide yellow precipitate is formed. <br> `Pb(NO_3)_2(aq) + 2KI to PbI_2(s) + 2KNO_3(aq)` <br> This is an example for a chemical reaction (double displacement) in which formation of precipitate is observed.

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

Answer

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LeadII nitrate reacts with potassium iodide to form leadII iodide and potassium nitrate. How do you write a balance equation for this?