Which measurement indicates the acidity or basicity of a liquid?

The measurement that indicates the acidity or basicity of a liquid is pH. The pH scale quantifies the concentration of hydrogen ions in a solution, with lower values indicating acidity (more hydrogen ions) and higher values indicating basicity (fewer hydrogen ions). A pH of 7 is considered neutral, values below 7 represent acidic solutions, and values above 7 indicate basic solutions.

Understanding pH is crucial in wastewater treatment, as it can significantly impact the effectiveness of various processes and the overall treatment performance. Monitoring pH helps ensure that the conditions are optimal for microbial activity, chemical treatment processes, and compliance with regulatory standards.