Question

What happens when potassium iodide solution is added to lead nitrate solution ? give equation of the reaction involved. what type of reaction is represented by this example ?

Answer 1

2KI + Pb(NO₃)₂--------> 2KNO₃ + PbI₂

This is double displacement reaction, as ions of both reactant get interchanged.

Answer 2

Potassium iodide solution is added to lead nitrate solution this reaction known as Precipitation Reaction and Double replacement reaction:

Explanation:

If potassium iodide solution is added to lead nitrate solution then after reaction potassium nitrate and yellow coloured lead iodide will be formed. This is called double replacement reaction.

$\mathrm{Kl}+\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \rightarrow \mathrm{KNO}_{3}+\mathrm{Pl}_{2} \downarrow$

The above reaction is not balanced reaction so we need to balance the reaction. So after balancing the reaction we get

$2 \mathrm{Kl}+\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}=2 \mathrm{KNO}_{3}+\mathrm{Pl}_{2} \downarrow$

Here after the reaction of potassium iodide and lead nitrate the potassium nitrate and lead iodide will be formed. A yellow coloured lead iodide precipitate will be formed. So this reaction is also called precipitation reaction.