PH is a parameter used to measure the concentration of the hydrogen ion [H +] in a solution. In definition pH, it is the negative logarithm of base 10 of the activity of the [H +]. PH values ​​vary on a scale from 0 to 14, which indicates the degree of acidity or alkalinity of an aqueous solution.

Water pH:

the pH of pure water has a value of 7.0. (Neutral)

Milk pH

Cow’s milk has a pH between 6.6 and 6.8; weakly acidic. For milk, pH values ​​below 6.5 or above 6.9 are considered abnormal values.

Human body pH

The pH value in normal blood ranges between 7.35 and 7.45. Any small change from normal values ​​has severe implications.

The human body has a variety of fluids that have different pH values. Saliva is a fluid present in the oral cavity, which has a pH between 6.5 and 7.5. After swallowing, the food reaches the stomach where the upper parts have different pH’s. The upper part of the stomach has a pH of 4 to 6.5 (acidic), while the lower part is even more acidic, with a pH of 1.5 – 4.0. In the digestive tract, the pH is 7 – 8.5 (slightly alkaline). These, among many others.

The pH is a decisive factor to preserve the ideal conditions so that the different biological processes are possible; since the biomolecules that participate in them, such as proteins and enzymes, require a specific pH to be effective. A significant acid-base imbalance (outside normal values, however minimal) in humans generates a cascade of alterations; that by not being regained the balance in time causes death.

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