Final answer:
The pH scale is used to measure the acidity or basicity of a solution. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic.
Step-by-step explanation:
The subject of this question is Chemistry and it is at a High School level.
The pH scale is used to measure the acidity or basicity of a solution. A pH of 7 is termed neutral, below pH 7 is considered acidic, and above 7 is considered basic.