When baking soda (sodium bicarbonate) and vinegar (acetic acid) are mixed, they undergo a chemical reaction to form carbon dioxide gas, water, and sodium acetate. The chemical equation for this reaction is:
NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa
This reaction is a classic example of an acid-base reaction, where an acid (vinegar) and a base (baking soda) react to form a salt (sodium acetate) and water. The carbon dioxide gas produced in the reaction is what causes the fizzing and bubbling that is often observed when these two substances are mixed.
Physical changes, on the other hand, involve changes in the physical properties of a substance without altering its chemical composition. Examples of physical changes include changes in shape, size, or state of matter (such as melting, freezing, or boiling).
