Aqueous substances with a pH greater than or equal to 12.5 are classified as what type of waste?

Aqueous substances with a pH greater than or equal to 12.5 are classified as corrosive waste. This classification stems from the definition of corrosive substances, which are capable of damaging materials or living tissues through chemical action. In the context of waste management, corrosive wastes have a pH that indicates high alkalinity, which can lead to significant hazards if they come into contact with skin, living organisms, or the environment.

Corrosive wastes pose risks not only due to their ability to corrode materials but also because their reactive nature can result in chemical burns, environmental damage, and complications during disposal if not managed correctly. Understanding the classification helps in determining appropriate handling, storage, and disposal methods to ensure safety and compliance with regulations that govern hazardous waste management.