Answer:
The correct answer is pH.
Step-by-step explanation:
The pH is a measure that is used to determine the acidity or alkalinity of a substance.
Its acronym is for hydrogen potential or hydrogenation potential.
It can be measured through a potentiometer or pH meter, which measures the potential difference between reference electrodes and glass electrodes that are sensitive to hydrogen ion.
It is a very important procedure and widely used in chemistry and biochemistry, since it determines many significant characteristics of the structure and activity of the molecules.