Question

A milk man add a very small amount of baking soda to fresh milk (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline (b) Why does this milk take a long time to sat as curd ?​

Answer 1

Explanation:

In the problem, the Milkman adds a small amount of baking soda into fresh milk to make the pH increase from 6 to slightly alkaline. Milkman does it because after increasing pH to make the milk more basic in nature. If the pH decreases, the milk will be spoiled and not be drinkable. a) By adding a very small amount of baking soda to fresh milk, the milkman keeps the milk unspoiled for little more time than usual time. With the addition of baking soda, the pH value increases and the milk turns to slightly alkaline which makes milk be preserved for longer use. b) As baking soda is added, it turned into a base. But curd needs acidic condition to set. Hence this milk takes a long time to set as a curd.

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