Massachusetts Wastewater Practice Exam

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Which of the following pH levels indicates an acidic solution?

The correct answer is: 3

A pH level of 3 indicates an acidic solution because the pH scale ranges from 0 to 14, where values below 7 represent acidity, values of 7 represent neutrality, and values above 7 indicate alkalinity. A pH of 3 suggests a higher concentration of hydrogen ions, which characterizes acidic solutions. In contrast, a pH of 7 is neutral and represents pure water, while pH levels of 10 and 12 are alkaline, with increased levels of hydroxide ions. Therefore, the pH of 3 clearly signifies an acidic solution, making it the correct answer.