Which action is critical when treating a chemical burn?

The immediate removal of clothing is critical when treating a chemical burn because clothing can trap the chemical against the skin, exacerbating the injury and increasing tissue damage. In many cases, the clothing may be contaminated with the chemical agent, and allowing it to remain in contact with the skin prolongs exposure. By removing the clothing as quickly as possible, emergency responders can help minimize the burn's severity and reduce the risk of further harm.

Although other actions, such as assessing the degree of the burn or providing intravenous fluids, are important aspects of overall burn care, they are secondary to the immediate need to stop the chemical exposure. Application of ice is also generally contraindicated for burns as it can lead to further tissue damage and should be avoided in this context. Therefore, the priority in managing a chemical burn is to ensure that the source of the chemical is removed effectively and swiftly.