Use of dichromate, piranha solution, sulfuric acid, or other strong acids or strong oxidizer cleaning solutions should be used:

Use of dichromate, piranha solution, sulfuric acid, or other strong acids or strong oxidizer cleaning solutions should be used:

• A. Only on specific direction of your instructor
• B. Never use them
• C. Whenever you think it is necessary
• D. In the hood, if available

Answer: (A)

Handling strong oxidizers and concentrated acids requires supervision and a defined protocol because they are highly hazardous and can cause severe burns, toxic fumes, and violent reactions if used improperly. The safest practice is to follow your instructor’s direction for these cleaners, along with the lab’s approved procedures. This ensures you’re using the right concentrations, the correct order of operations (such as how to add acid to water, if relevant), and that appropriate containment and waste disposal steps are in place. The instructor can also verify that the proper PPE is used and that a fume hood or other controls are available and functioning. Even when a hood is available, authorization is necessary to ensure you’re applying the protocol correctly and maintaining safety. Choosing to use them without explicit guidance or outside the approved protocol greatly increases the risk of exposure, runaway reactions, or spills.

Handling strong oxidizers and concentrated acids requires supervision and a defined protocol because they are highly hazardous and can cause severe burns, toxic fumes, and violent reactions if used improperly. The safest practice is to follow your instructor’s direction for these cleaners, along with the lab’s approved procedures. This ensures you’re using the right concentrations, the correct order of operations (such as how to add acid to water, if relevant), and that appropriate containment and waste disposal steps are in place. The instructor can also verify that the proper PPE is used and that a fume hood or other controls are available and functioning. Even when a hood is available, authorization is necessary to ensure you’re applying the protocol correctly and maintaining safety. Choosing to use them without explicit guidance or outside the approved protocol greatly increases the risk of exposure, runaway reactions, or spills.