Question

An aqueous solution of lead acetate is treated with an aqueous solution of potassium iodide when a precipitate is obtained.

Write the balanced chemical equation for the reaction.

Answer 1

Chemical reaction: When two or more substance or reactant reacts with each other and forms a different type of substance is called a chemical reaction.

• These are the following types of reactions: Displacement reaction, Double displacement reaction, decomposition reaction, oxidation reaction, etc.

Double displacement reaction: A chemical reaction in which an exchange of ions occurs between the reactant is called a double displacement reaction.

• In this type of reaction, an insoluble product is formed called the precipitate.
• The precipitate which is formed in this reaction is show color, depending upon the nature of the precipitate.
• For example — $\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$ $+$ $2\mathrm{KI}$ $\to$$2{\mathrm{CH}}_3\mathrm{COOK}$ $+$ ${\mathrm{PbI}}_2$

lead Iodide ppt [Bright yellow powder]

• The colour of the precipitate of this reaction is bright yellow.
• The name of the precipitate and formula is lead iodide & ${\mathrm{PbI}}_2$ respectively.
• The given reaction is a double displacement reaction.
• The balanced chemical reaction is

$\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$ $+$ $2\mathrm{KI}$ $\to$$2{\mathrm{CH}}_3\mathrm{COOK}$ $+$ ${\mathrm{PbI}}_2$