Question

how to test the presence of baking soda in milk at home

Answer 1

took a little sample and add turmeric red means milk is basic that's automatically tells NaHCO3 in milk .this can be more clear after this see turmeric is a natural indicator so in basic medium it turns red . this shows that milk is basic in nature.
Hope it helps!

Answer 2

by taking a little sample add turmeric.as turmeric is a natural indicator in basic medium it turns red.
so now we clear that baking soda is present in milk.