Diprotic is a term used in chemistry to describe a molecule or compound that contains two ionizable hydrogen atoms. Some synonyms for diprotic include bivalent, divalent, and 2-hydronic. Additionally, diprotic compounds are often referred to as acids, such as diprotic acids or binary acids. Other related terms include amphiprotic, which describes a molecule that can either donate or accept a proton, and monoprotic, which refers to a molecule that contains only one ionizable hydrogen atom. Understanding these various terms is critical in studying the properties and reactivity of acidic substances.