ClSO3H, known as chlorosulfonic acid, is a colorless, fuming liquid that is highly corrosive. It is composed of chlorine (Cl), sulfur (S), and oxygen (O), with the chemical formula ClSO3H. This compound is primarily used in the production of various chemicals, including detergents and dyes, due to its strong acidic properties. Chlorosulfonic acid is a strong acid and a powerful sulfonating agent, meaning it can introduce sulfonic acid groups into organic compounds. It is important to handle ClSO3H with care, as it can cause severe burns and is reactive with water, releasing toxic gases. Proper safety precautions are essential when working with this chemical.