What happens when potassium iodide solution is added to a solution of lead nitrate?

Chemical reactions are an important part of our daily life. today, you will learn  What happens when potassium iodide solution is added to a solution of lead nitrate? The reaction is related to Chemical reactions and equations.

When lead nitrate reacts with potassium iodide, a yellow precipitate is formed, so a precipitation reaction occurs.

In this reaction, solid lead iodide and aqueous potassium nitrate are formed.

The balanced chemical equation for the reaction is 

Pb(NO₃)₂ + 2KI  →  PbI₂ + 2KNO₃

`Pb(NO3)_2  →  Pb^(2+)+ NO_3^-`

`KI     →  K^++ I^-`

`Pb^(2+)+ I^-   →PbI_2 `

`K^++ NO_3^-  →KNO_3` 

 The lead cations (`Pb^2+`) from the lead nitrate solution combine with the iodide anions (`I^-`) from the potassium iodide solution to form solid lead iodide (`PbI_2`), a yellow precipitate. At the same time, potassium cations (`K^+`) from the potassium iodide solution combine with the nitrate anions (`NO3^-`) from the lead nitrate solution to form aqueous potassium nitrate (`KNO_3`), which remain in the solution.

 

Due to the formation of a precipitate, the reaction is called a ‘Precipitation reaction’

The reaction between lead nitrate and potassium iodide is a double displacement reaction because the exchange of ions takes place.

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FAQs

    1.  What is the colour of the precipitate of lead iodide?

Ans.- The precipitate of lead iodide is yellow.

   

    2.  What is a double displacement reaction?

Ans, The reaction in which two compounds react by exchange of ions to form two new compounds is called a double displacement reaction.

   

    3.  What is a precipitation reaction?

Ans. – A precipitation reaction is a reaction in which two solutions are mixed and an insoluble compound is formed which is called a precipitate and the reaction is called a precipitation reaction.

   

   4.  What type of reaction is lead nitrate and potassium iodide reacts?

Ans. Double displacement reaction

   

   5.  What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?

Ans.-  When a solution of potassium iodide is added to a solution of lead nitrate, a yellowish solid precipitate of lead iodide is formed.