Question

During summer milkman usually adds a very small amount of baking soda to fresh milk explain

Answer 1

During summer seasons the temperature is often at a new high to give the enzymes and bacterium a chance to chemically react and give the milk an unpleasant taste sometimes a clear showcase of pungent smell.
This is due to the lactobacillus bacterium which involves with the reaction in the milk to create a acid which is also found commonly in human muscles and epithelial structures due to excessive exercise known as the lactic acid. This makes the milk acid in its nature and changes the whole chemistry, actually it is still good for health and does not form another chemical inside the body or cause any know harmful effects to the humans.
To make this pungent smell and the acidic nature plus the unpleasant infamous taste, Sodium bicarbonate or baking soda is added to the solution to clear the acidity of the milk (as it is basic in nature) it also adds salt and carbon dioxide to the solution making the taste way much better than its initials.

Answer 2

Answer:

Becoz baking soda is a base which reacts with acids and neutralizes it. This prevents milk from getting sour and keeping it fresh for long time.....

Hope it help you ✌️❣️