Here's why:
* Baking soda (sodium bicarbonate) is a base.
* Vinegar (acetic acid) is an acid.
When you combine them, an acid-base reaction occurs, producing:
* Carbon dioxide gas (which you see as bubbles)
* Water
* Sodium acetate (a salt)
This reaction releases heat into the surroundings, which is why it feels warm. This means the reaction is exothermic.
In simple terms, the chemical bonds in the reactants (baking soda and vinegar) are stronger than the bonds in the products (carbon dioxide, water, and sodium acetate). This excess energy is released as heat.
So, while the reaction itself consumes some energy to break the bonds in the reactants, the overall process releases more energy, making it an exothermic reaction.
