Question

why milkman adds a very small amount of baking soda to fresh milk​

Answer 1

Answer:

At this pH, milk soon becomes spoiled and becomes undrinkable. So it cannot be kept for a longer time. To prevent the spoilage of milk, the milkman adds a very small amount of baking soda to fresh milk.

Answer 2

Answer:

As milk is bit acidic, the milkman adds a small amount of baking soda to it to neutralize it and it keeps the milk unspoiled for longer time than usual