Question

during summer season, a milkman add add of very small amount of baking soda to fresh milk why??​

Answer 1

because the baking soda increases its pH level so the milk doesn't spoil/sour so easily it will take more time to become sour/spoiling in summer season

Answer 2

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A milkman add add of very small amount of baking soda to decrease the rate of fermentation.

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Milk contains in it small amount of lactic acid. When the acid is in excess, the milk becomes sour. In summer, milk may undergo fermentation releasing more of lactic acid. As a result, it is likely to become sour. In order to neutralize the effect of lactic acid, a milkman generally adds a small amount of baking soda to fresh milk.