Emergency Medical Technician (EMT) Intermediate Practice Exam

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What is measured to determine a solution's acidity?

Density
pH
Viscosity
Alkalinity

The correct answer is: pH

To determine a solution's acidity, pH is the key measurement used. The pH scale ranges from 0 to 14, with lower values indicating greater acidity, values around 7 indicating neutrality, and higher values indicating alkalinity. By measuring the concentration of hydrogen ions present in the solution, the pH indicates whether the solution is acidic, neutral, or basic. Acidic solutions have a pH less than 7, while basic solutions have a pH greater than 7. The other measurement options are less relevant for determining a solution's acidity. Density refers to the mass per unit volume of a substance, which does not provide information about its acidic or basic nature. Viscosity measures a fluid's resistance to flow, and while it can influence how substances mix or react, it does not indicate acidity. Alkalinity is related to the capacity of water to resist changes in pH and refers specifically to the concentration of alkaline substances, not directly measuring acidity. Thus, pH is the definitive measure for assessing the acidity of a solution.