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A milkman adds a very small amount of baking soda to fresh milk.
Acids, Bases and Salts | CBSE | Chemistry | Class 10 | NCERT | Science
A milkman adds 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 set as curd?

Answer:

(a) To prevent the milk from becoming sour due to the creation of lactic acid, he changed the pH of the fresh milk from 6 to slightly alkaline.

(b) This milk takes a long time to get converted into curd because the lactic acid produced here first neutralizes the pH before lowering it to convert milk to curd.

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