HC2H3O2 refers to acetic acid, which is a weak acid found in vinegar. It has a sour taste and pungent smell.
Sodium acetate is a salt formed by the reaction of acetic acid (HC2H3O2) with sodium hydroxide (NaOH). It is commonly used as a food preservative.
Hydrochloric acid is a strong acid commonly found in our stomachs. It can be dangerous if not handled properly.
Acid dissociation constant, also known as the acidity constant. It represents the extent to which an acid donates its protons in solution.