Sagot :
Exothermic because you are releasing heat not absorbing.
The definition of an exothermic reaction is releasing heat and endothermic reaction is an absorption of heat.
This reaction is exothermic because it releases heat and doesn't absorb it when mixing hydrochloric acid with water.
This reaction is exothermic because it releases heat and doesn't absorb it when mixing hydrochloric acid with water.