Discussion
pH of cow's milk is :
Answer: D
Fresh cow's milk has a pH of about 6.6 - 6.9, slightly on the acid side of neutral.
The mild acidity comes from the casein, phosphates, citrates and dissolved carbon dioxide in milk. Dairy tests use this narrow range: when lactic acid bacteria sour the milk, the pH falls and the casein begins to curdle at around 4.6.
A pH of 7.1 - 7.6 is alkaline and is a sign of mastitis milk rather than normal milk. The lower ranges, 6.0 - 6.4 and 5.0 - 6.0, describe milk that has already begun to sour.
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