What does a pH level below 7 indicate?

A pH level below 7 indicates an acidic solution. The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 signify an increase in hydrogen ions (H+) in the solution, which results in acidity. Common examples of acidic substances include vinegar, lemon juice, and battery acid, all of which have pH values below 7. This knowledge is essential in various applications, including food service, where the pH can affect both the safety and quality of food products, as well as their flavor profiles and preservation methods.

In contrast, neutral solutions, such as pure water, have a pH of exactly 7, while basic (or alkaline) solutions have a pH above 7. Contaminated solutions can vary widely in pH depending on the contaminant, so specifying that a pH below 7 indicates contamination would be inaccurate. Understanding pH is crucial in food safety, chemical reactions, and equipment maintenance.