Arkansas State Barber Practice Exam

The pH of a liquid is a measure of its concentration of hydrogen ions. This term specifically refers to the amount of positively charged hydrogen atoms that are present in the liquid. A lower pH value indicates a higher concentration of hydrogen ions, meaning the liquid is more acidic. The pH scale ranges from 0 to 14, with 7 being neutral.

Option A, acidity, is a correct explanation of pH. As mentioned, a lower pH value indicates a higher concentration of hydrogen ions and therefore a more acidic substance.

Option B, alkalinity, is incorrect because it refers to the opposite end of the pH scale. A higher pH value indicates a lower concentration of hydrogen ions and therefore a more basic or alkaline substance.

Option D, oxygen, is incorrect because oxygen does not play a direct role in defining pH. Oxygen is a component of water, which can affect pH levels, but it is not the defining factor.

In summary, pH specifically refers to the concentration of hydrogen ions in a liquid and is a measure of its acidity or basicity.