a milkman adds a very small amount of baking soda to fresh milk. Why?

During summers, milkman usually adds a small amount of baking soda. It is so because during summers, the activity of bacteria increases which increases the acidity of milk with time. Baking soda is slightly basic(alkaline), thus it neutralises the excess acid in the milk produced by bacteria and thus milk is prevented from spoilage.

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It makes milk a bit alkaline so as to reduce the pace of bacteria acting on it as they acid (lactic acid) to the milk and turn it sour. This keep the milk from becoming sour for a long time.

            hope u understood

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