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Milk has a pH of 6.6 to 6.8 when it is fresh. When bacteria in the milk grows and multiplies, chemicals are released that lowers the pH of the milk (makes it more acidic). Lactose converted into lactic acid will increase the acidity of the product.

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11y ago
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13y ago

it becomes more acidic

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Q: Why does milk get a higher pH level when it goes off?
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