Answer:
A substance with a pH of 3 is called an acidic substance.
Step-by-step explanation:
The pH —which means potential hydrogen— depends on the concentration of hydrogen present in a compound, establishing which substances are acid, base or neutral.
The chemical expression of pH is:
pH = -㏒₁₀ αH⁺
where α is the activity of hydrogenions.
The pH is in a scale that goes from 1 to 14, where 7 is neutral, less than 7 is acid and greater than 7 corresponds to an alkaline or basic substance. A substance with a pH of 3 is acidic, which would correspond to the pH of lemon juice or vinegar.