Question

why does the milkman add baking soda to fresh milk?​

Answer 1

to make the milk look more white

Answer 2

To prevent the spoilage of milk, the milkman adds a very small amount of baking soda to fresh milk. Addition of baking soda increases the pH of milk from 6. The milk is now alkaline. Due to this milk can be kept for a relatively longer time

Hope it helps