What is the range of values from 0 to 14 used to measure acidity or basicity?

• A. pH Indicator
• B. pH Scale
• C. Acidity Range
• D. Ionization Scale

Answer: (B)

The pH scale is the measure used to describe how acidic or basic a solution is. It runs from 0 to 14, with 7 being neutral at room temperature; numbers below 7 indicate increasing acidity and numbers above 7 indicate increasing basicity (alkalinity). The scale is logarithmic, meaning each one-unit change represents a tenfold change in hydrogen ion concentration, so a small shift in pH signals a big change in acidity or basicity. This standard range is commonly used for aqueous solutions in chemistry, biology, environmental science, and food science, helping determine how suitable a solution is for a given process or organism.

A pH indicator, while helpful for showing where a solution falls on the scale by color change, does not itself define the numerical range. Other terms like acidity range or ionization scale aren’t standard ways to quantify acidity or basicity in this context.