Is poly aluminium chloride an acid or alkali?

Polyaluminum chloride (PAC) is neither an acid nor an alkali; it is a type of aluminum-based coagulant used for water treatment and other applications. It is typically in the form of a yellowish powder or liquid solution. PAC works by neutralizing the electrical charges of particles in water, causing them to coagulate and settle, thereby clarifying the water. The substance itself is not classified as an acid or a base; its pH level can vary depending on the concentration and the specific formulation, but it is generally formulated to be slightly acidic when dissolved in water for use in water treatment processes.