What does ceric mean?
Ceric is a technical adjective used almost exclusively in chemistry to describe compounds of the rare-earth metal cerium when the element is in its highest common oxidation state of +4. A compound described as ceric contains the Ce⁴⁺ ion, as in ceric sulfate or ceric oxide, and these species are valued in laboratories for their strong oxidizing power — ceric ammonium nitrate, for instance, is a staple reagent in analytical chemistry. The term contrasts with cerous, which refers to the +3 state, so distinguishing the two suffixes matters whenever precision about oxidation state is required. Outside scientific literature the word is rarely encountered, and contemporary nomenclature increasingly favors explicit forms such as cerium(IV); nevertheless, ceric persists in established reagent names, textbooks, and industrial usage. For students of chemistry, it offers a compact way to signal both the element and its electronic state at once.
adjectiveOf or relating to cerium, especially denoting compounds of cerium in which the metal is in its tetravalent (+4) state.
- Denoting cerium in its +4 oxidation state or its tetravalent compounds.
"The chemist prepared a solution of ceric sulfate for the redox titration."
"A standard solution of ceric ammonium nitrate was used to determine the iron content of the sample."
"On exposure to air, cerous salts slowly oxidize to the ceric state."
Named after an asteroid: cerium itself was christened in honor of the dwarf planet Ceres, discovered just two years earlier, so every ceric compound carries a little astronomy in its name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ceric
Ceric derives from cerium, the metallic element named by its discoverers after the asteroid Ceres, which had been identified only shortly before the element's isolation in the early nineteenth century. The suffix -ic follows the classical chemical convention for marking the higher of two oxidation states, paired here with -ous in cerous for the lower one. Its cognates are chiefly other cerium-related terms, including ceria (cerium dioxide) and cerite, a cerium-bearing mineral.
How ceric is actually used
Strictly technical vocabulary confined to chemistry and related sciences; it is not used in general conversation. In modern IUPAC-style nomenclature it is often replaced by explicit oxidation-state notation such as 'cerium(IV)', though the traditional names remain common in laboratory practice.
Easily confused with ceric
Cerous denotes trivalent (+3) cerium compounds, whereas ceric denotes tetravalent (+4) ones.