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Question

Two of the most commonly used salts are sodium chloride (NaCI) and sodium bicarbonate (NaHCO3). Find out which of these is used (i) as baking powder, (ii) as a preservative in pickles and in preserving meat and fish and also think of the respective reasons for doing so.


Solution

(i) Sodium bicarbonate (NaHCO3) is used as baking powder. 
When added to a batter, sodium bicarbonate reacts with the acidic components present in it and releases carbon dioxide. This causes expansion of the batter, which gives a characteristic texture to it.

(ii) Sodium chloride (NaCl) is used as a preservative in pickles. It is also used in preserving meat and fish. 
Being a neutral substance, sodium chloride does not bring any change, either acidic or basic, when added to a food substance. In this way, the food substance can be preserved for a long period of time.

Science
Everyday Science
Standard VII

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