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A milkman adds a very small amount of ba...

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?

Text Solution

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(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, milk does not set as curd easily.
(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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Knowledge Check

  • A milk man adds a very small amount of baking soda to fresh milk. Why?

    A
    To increase the rate of fermentation
    B
    To decrease the rate of fermentation
    C
    To increase its quality
    D
    To make paneer

  • A milkman adds a small amount of baking soda to fresh milk:

    A
    To improve taste of milk
    B
    To increase the cream in the milk
    C
    To prevent acidisation of milk
    D
    To improve the consistency of milk

  • Fresh milk has a pH of 6. When milk changes into curd, the pH value will:

    A
    become 7
    B
    become less than 6
    C
    become more than 7
    D
    remain unchanged.

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    A milkman cheats his customers by adding water to the milk he sells. He starts the day with 1000 litres of milk. However, after selling every 500 litres of milk, he adds an equal quantity of water to what he already has. The milkman can get away by cheating as long as the milk to water ratio does not fall below 1 : 7. Each customer brings exactly 2 litres of milk a day (except for the first 100 who buy 5 litres each). The total number of customers the milkman has cheated if he ends up selling all the milk is :

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