Step 1: Understanding the Concept:
pH is a measure of the acidity or alkalinity of an aqueous solution. Pure water has a pH of 7.0 (neutral), and substances with a pH lower than 7 are considered acidic.
Step 2: Detailed Explanation:
Milk is slightly acidic in nature.
The pH of fresh cow's milk typically ranges between 6.7 and 6.9.
Factors like the presence of dissolved carbon dioxide, milk proteins, and mineral salts contribute to this slightly acidic value.
As milk sours due to bacterial activity, lactic acid is produced, which causes the pH to drop significantly lower than this range.
Step 3: Final Answer:
The pH range of milk is 6.7 - 6.9.