Here's a breakdown:
* Citric acid is a weak organic acid naturally found in citrus fruits like lemons, limes, oranges, and grapefruits.
* pH scale: The pH scale measures acidity and alkalinity. A pH of 7 is neutral. Lower numbers indicate acidity, and higher numbers indicate alkalinity. Lemons have a pH of around 2, which is quite acidic.
* Taste: The sour taste of lemons is due to the presence of citric acid.
* Uses: Citric acid is used not only in food but also in cleaning products, cosmetics, and pharmaceuticals.
So, the sourness of lemons is a direct result of the high concentration of citric acid they contain.
