Question

The given reaction of $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)+2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)$ is endothermic/exothermic?

Answer 1

Exothermic reactions:

• The chemical reaction in which the heat is released is known as an Exothermic reaction.
• Examples are the burning of a candle and the reaction of a strong acid with water.

Endothermic reactions:

• The chemical reaction in which the heat is absorbed is known as an Endothermic reaction.
• Examples are melting ice cubes and melting solid salts.

Given reaction is exothermic or endothermic

• The given reaction is as follows:-

$\mathrm{Ba}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)+2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)\to {\mathrm{BaCl}}_2\left(\mathrm{s}\right)+2{\mathrm{NH}}_3\left(\mathrm{g}\right)+2{\mathrm{H}}_2\left(\mathrm{g}\right)$

• In this reaction, Barium hydroxide reacts with Ammonium chloride, formation of Barium chloride, ammonia, and hydrogen gas takes place.
• Reactions in which there is an exchange of ions between the reactants are called double displacement reaction
• The given reaction is a double displacement reaction.
• In this reaction, heat is absorbed for the formation of the product.
• In an endothermic reaction, the $\mathrm{\Delta }H$ is positive corresponding to the absorbed heat.

Hence, the given reaction is an endothermic reaction.