Question

What type of chemical reaction when potassium iodide react with lead nitrate?

Answer 1

Types of chemical reactions:

Combination reaction - Two or more compounds combine to form one compound.

Decomposition reaction - A complex molecule breaks down to make simpler ones.

Precipitation reaction - Two solutions of soluble salts are mixed resulting in an insoluble solid (precipitate) forming.

Neutralization reaction - An acid and a base react with each other and the product of this reaction is salt and water.

Combustion reaction - Oxygen combines with a compound to form carbon dioxide and water.

Displacement reaction - One element takes place of another element in the compound.

Double displacement reaction - A chemical reaction in which ions gets exchanged between two reactants to form a new compound is called a double displacement reaction.

Chemical reaction:

$\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)+2\mathrm{KI}\left(\mathrm{aq}\right)\to {\mathrm{PbI}}_2\left(\mathrm{aq}\right)+2{\mathrm{KNO}}_3\left(\mathrm{aq}\right)$

The reactants are exchanging their ions to form two new products.

Therefore, the reaction of Potassium iodide with Lead nitrate is a type of double displacement reaction.