Question

Why heat is evolved during the reaction between hcl and sodium chloride

Answer 1

1. It must be Sodium Hydroxide and not Sodium Chloride as there is no reaction between HCl and NaCl.

2. The reaction between HCl and NaOH is as shown:

HCl + NaOH $\to$ H₂O + NaCl + Heat

3. This heat evolved is due to the neutralisation reaction occurring between an acid and a base.