Monobasic acid is a type of acid that has only one acidic hydrogen atom per molecule. There are several synonyms for this type of acid, including univalent acid, uniprotic acid, and monoacid. Univalent acid refers to the fact that the acid has a valence of one, while uniprotic acid indicates that it has only one proton to donate. Monoacid simply means a single acid. Other examples of monobasic acids include hydrochloric acid, nitric acid, and acetic acid. These acids play important roles in chemical reactions, such as in the production of fertilizers and in the breaking down of foods during digestion.