Na3AsO4, also known as sodium arsenate, is a chemical compound composed of sodium, arsenic, and oxygen. It appears as a white, crystalline solid and is soluble in water. This compound is often used in various applications, including as a herbicide, insecticide, and in the manufacturing of glass and pigments. Sodium arsenate is classified as a toxic substance due to the presence of arsenic, which can be harmful to human health and the environment. Proper safety measures should be taken when handling it, and it is regulated in many countries to prevent misuse and exposure.