Arsenate is an ion with the chemical formula AsO4³?. It consists of one arsenic atom bonded to four oxygen atoms. Arsenate compounds, known as arsenates, are salts or compounds that contain this ion. Arsenates are commonly encountered in chemistry and environmental sciences and are formed when arsenic is in its pentavalent state (+5 oxidation state) and bound to oxygen. They have diverse applications and can be found in minerals, fertilizers, pesticides, and in the context of environmental contamination.