Which involves a chemical change combining an acid and base dew forming sour milking?

The process of souring milk involves a chemical change known as fermentation, where lactic acid bacteria convert lactose (the sugar in milk) into lactic acid. This acidification acts like a mild acid, and when it combines with proteins in the milk, it causes coagulation, resulting in the formation of curds and whey. The interaction of the acid with the milk proteins alters the chemical structure, leading to the sour taste and thicker texture characteristic of sour milk products.