Which of the following acids is NOT commonly used in pH neutralization?

Hydrofluoric acid is not commonly used in pH neutralization processes. It is primarily known for its unique and hazardous properties, making it highly dangerous to handle. Hydrofluoric acid is used in specialized applications such as glass etching and metal cleaning, rather than in wastewater treatment or pH neutralization.

In contrast, sulfuric acid and hydrochloric acid are both strong acids frequently utilized to lower pH levels in various treatments, including wastewater. Sodium hydroxide, although a strong base, is instrumental in raising the pH in neutralization processes. Therefore, the other options are integral to managing pH levels in wastewater treatment, while hydrofluoric acid is not suitable for this purpose due to its hazardous nature and specialized uses.