Copper(II) arsenate is a chemical compound composed of copper, arsenic, and oxygen, with the formula Cu3(AsO4)2. It typically appears as a greenish or blue solid and is often used in various applications, including as a pesticide and wood preservative. This compound is part of a larger group of arsenates, which are salts or esters of arsenic acid. Due to the presence of arsenic, copper(II) arsenate can be toxic and must be handled with care to avoid environmental contamination and health risks.