Question

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?

NCERT Class X
Science - Science

Chapter_Acids Bases and Salts

Answer 1

Answer:a) on addition of small amount of baking soda , the milk will be slightly alkaline to stop the curdling

b) This milk takes a long time to set as curd because the lactic acid produced reacts with the baking soda.

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Explanation:

Answer 2

a. It is mainly done to stop the milk from curdling for a longer period of time when the milk is made more alkaline by adding a base to it. For this reason, the milkman changes the pH of fresh milk by adding a very small amount of baking soda, which is alkaline by nature and balances the acidic character of milk.

b. Due to this milk's minor alkaline advantage over others, the milkman will add baking soda to balance the acid that would otherwise cause curd to form. As a result, the curd in this milk takes longer to form.

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