Answer:
Lemon contains citric acid, while milk contains lactic acid.
Step-by-step explanation:
Citric acid is a weak organic acid with the molecular formula C6H8O7. It is a natural preservative and is commonly used as a food additive to give a sour or acidic taste to foods and beverages. Citric acid is found in many fruits, including lemons, limes, oranges, grapefruits, and berries, and is responsible for their sour taste.
Lactic acid, on the other hand, is a weak organic acid with the molecular formula C3H6O3. It is produced by the metabolism of lactose (milk sugar) by certain bacteria, such as Lactobacillus and Streptococcus. Lactic acid is found in many fermented foods, such as yogurt, sourdough bread, and sauerkraut, and is responsible for their tangy or sour taste. Milk naturally contains a small amount of lactic acid, but the concentration can increase during fermentation or when it spoils