State the reason for following statementsa. When a milkman adds a very small amount of baking soda to
fresh milk then this milk take a long time to set as curd?
b. Plaster of Paris should be stored in a moisture-proof container
c. distilled water not conduct electricity, whereas rain water does
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Answers
Answer:
a) When the milk is made more alkaline by adding a base to it, it is basically done to prevent it for more time to turning to curd. That’s why milkman shifts the pH of fresh milk to slightly alkaline by adding a very small amount of baking soda to it as baking soda is alkaline in nature and it neutralizes the acidic nature of milk.
As this milk is slightly more alkaline than other, therefore, acid produced to set into curd will be neutralized by baking soda added by milkman. Hence, this milk takes a longer time to set as curd.
b) Plaster ob Paris-> gypsum when reacted with water
caSO 4 . 1/2 H 2 O + 1 ( 1/2) H20 -> CaSO 4 . 2 H20
c) Distilled water is a pure type of water which does not contain any ions in it. ... These gases dissolve in water to form some kind of acids like carbonic acids which dissociates to give ions. Thus rainwater is conducting electricity while distilled water is not conducting electricity.
Hope these answers are helpful