Chemical Hygiene Officer Practice Exam

What is the typical pH range to neutralize acids or bases before disposal?

2.0 - 4.0 9.0 - 11.0 0.5 - 1.5 5.5 - 8.5

Correct Answer:

5.5 - 8.5

Explanation:

Neutralizing acids or bases before disposal aims to bring laboratory waste to a near-neutral pH so it’s safer for workers, equipment, and the wastewater system. The best target is a near-neutral window, commonly around 5.5 to 8.5, because it minimizes corrosivity and reduces the risk of releasing hazardous conditions into sewers. Ranges that are strongly acidic (2.0–4.0) or strongly basic (9.0–11.0) keep waste corrosive and reactive, which is unsafe for disposal through typical sewer systems. In practice, facilities often aim for roughly the middle of the pH scale, and many regulatory guides list neutralization goals around pH 6–9. Always follow your local rules and the facility’s waste-handling plan.

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