NCERT Solution for Class Tenth Science Chapter 2
Acids, Bases and Salts
Exercises Questions
Page No-19
Questions No-12
(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?
(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, so that it takes longer time to be spoiled (become acidic).
(b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set.
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(a) Milkman shifts the pH of the fresh milk from 6 to slightly alkaline.This is because in an alkaline condition, milk does not coagulate into curd easily.
(b) The milk is slightly more basic than usual milk, as base neutralise the acids produced to set the curd. Therefore, it takes a longer time to convert the curd.