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a) What is a universal indicator ? b) ...

a) What is a universal indicator ?
b) A milk man adds a very small amount of baking soda to fresh milk.
i) Why does he shift the pH of the fresh milk from 6 to slightly alkaline.
ii) Why does this milk take a long time to set as curd.

Text Solution

Verified by Experts

a) A universal indicator is a mixture of a number of indicators which shows different colours at different pH values,
b) Since the fresh milk is acidic it turns sour early in presence of baking soda, milk become alkaline and does not turn sour easily because of alkali does not allow the milk to become more acidic early
ii) When the milk sets to curd the pH decreases i.e., it becomes more acidic the presence of alkali does not allow it to become more acidic easily hence it will take a long time to set as curd.
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