HAZMAT Technician Practice Exam

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What is one characteristic of a solution with a high pH?

It is highly acidic
It is highly basic
It is neutral
It is volatile

The correct answer is: It is highly basic

A solution with a high pH is indicative of being highly basic, which means it has a low concentration of hydrogen ions (H+) compared to hydroxide ions (OH-). The pH scale ranges from 0 to 14, with values below 7 considered acidic, a value of 7 considered neutral, and values above 7 considered basic or alkaline. When the pH approaches 14, the solution exhibits strong basic characteristics, which often correlates with higher concentrations of compounds like hydroxides. In contrast, an acidic solution corresponds to a low pH, typically below 7, where there is a greater concentration of hydrogen ions. A neutral solution, on the other hand, is balanced in hydrogen and hydroxide ions and maintains a pH of exactly 7. The term "volatile" does not pertain to the pH level but rather refers to the tendency of a substance to vaporize. Therefore, the characteristic of a high pH solution is that it is highly basic.