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A type of bacteria called "Lactic acid bacteria" ferment milk sugars, lactose to produce lactic acid. Its PH is around 4-5 and therefore it is acidic. Depending on the age and bacteria activity of the yoghurt, the inoculated milk can acidify the sugars enough to coagulate the proteins , resulting into a custard-like curd.

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Q: Why is yoghurt acidic?
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