Question

When milk left in a vessels overnight at a warm place, its taste sour. Why?

Answer 1

Answer:

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Answer 2

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• When milk left in a vessels overnight at a warm place, its taste sour. Why?

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• Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as a by-product.

• It is the lactic acid which makes milk taste sour.

More Information:

• Lactic acid, or lactate, is a chemical byproduct of anaerobic respiration — the process by which cells produce energy without oxygen around.

• Bacteria produce it in yogurt and our guts.

• Lactic acid is also in our blood, where it's deposited by muscle and red blood cells.