4-Aminophenylarsonic acid, commonly referred to as arsanilic acid (CAS 98-50-0), is an organoarsenic compound characterized by its off-white fine crystalline powder appearance. Understanding its fundamental chemical properties is essential for its safe handling and application in various industries. Arsanilic acid exhibits limited solubility in water, being sparingly soluble in cold water but more soluble in concentrated mineral acids, alkali carbonate solutions, alcohol, and diethyl ether. Its insolubility in acetone, benzene, and chloroform further defines its chemical behavior.

The stability of arsanilic acid is a key factor; it is generally stored in tightly closed containers in cool, dry, and well-ventilated areas, away from incompatible materials, excess heat, and strong oxidants. The compound's decomposition upon heating can release toxic fumes, including oxides of arsenic and nitrogen, necessitating careful temperature control and handling procedures. Given its toxic nature, strict safety measures are indispensable. This includes the use of appropriate personal protective equipment (PPE) such as gloves, eye protection, and respiratory masks when handling the substance. Workers should maintain thorough hygiene practices, washing hands and any exposed skin diligently after use. Proper ventilation in work areas is critical to minimize dust generation and accumulation. Emphasis on avoiding ingestion, inhalation, and skin or eye contact is paramount. For anyone looking to purchase arsanilic acid or use it in their processes, understanding these chemical properties and safety guidelines is the first step.

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