Question

Following reaction is an example of which type of reaction: NaCl + AgNO₃ gives AgCl + NaNO₃?

Answer 1

Double displacement reaction:

• A double displacement reaction is a type of chemical reaction in which two reactants exchange ions to form two new compounds.
• Mostly these reactions result in the formation of a precipitate as the product.
• Examples including the reactions are :

$\underset{(\mathrm{Hydrocholric}\mathrm{acid})}{\mathrm{HCl}\left(\mathrm{aq}\right)}+\underset{(\mathrm{Sodium}\mathrm{hydroxide})}{\mathrm{NaOH}\left(\mathrm{aq}\right)}\to \underset{(\mathrm{Sodium}\mathrm{chloride})}{\mathrm{NaCl}\left(\mathrm{aq}\right)}+\underset{(\mathrm{water})}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

$\underset{(\mathrm{Silver}\mathrm{nitrate})}{{\mathrm{AgNO}}_3\left(\mathrm{aq}\right)}+\underset{(\mathrm{Hydrochloric}\mathrm{acid})}{\mathrm{HCl}\left(\mathrm{aq}\right)}\rightleftharpoons \underset{(\mathrm{white}\mathrm{precipitate})}{\underset{(\mathrm{Silver}\mathrm{chloride})}{\mathrm{AgCl}\left(\mathrm{s}\right)⤓}}+\underset{(\mathrm{Nitric}\mathrm{acid})}{{\mathrm{HNO}}_3\left(\mathrm{aq}\right)}$

Reaction of $\mathrm{NaCl}$ ( Sodium chloride) and ${\mathrm{AgNO}}_3$ ( Silver nitrate):

• $\mathrm{NaCl}$ ( Sodium chloride) and ${\mathrm{AgNO}}_3$ ( Silver nitrate) to give $\mathrm{AgCl}$ ( Silver chloride) and ${\mathrm{NaNO}}_3$ (Sodium nitrate) .
• This is an example of a double displacement reaction.
• Here both silver nitrate and sodium chloride are colorless solutions, they form a white precipitate $\left(\mathrm{AgCl}\right)$and a colorless solution.
• Here silver displaces sodium from the solution forming the white precipitate.

Hence, the reaction of $\mathrm{NaCl}$ ( Sodium chloride) and $\mathrm{AgNO}3$ ( Silver nitrate) gives$\mathrm{AgCl}$ ( Silver chloride) and $\mathrm{NaNO}3$ (Sodium nitrate) is an example of a double displacement reaction.