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What is preservative ? How sodium metabisulphite act as preservative and in which food particles it is used ?

Answer»

SOLUTION :Preservative
Chemical substances which are used to PROTECT food against bacteria, yeasts and moulds are called preservatives.
The preservative action of sodium meta bisulphate`(Na_(2)S_(2)O_(5))` is due to `SO_(2)` which dissolves in WATER to give sulphurous acid.
`Na_(2)S_(2)O_(5) to Na_(2)SO_(3) +SO_(2)`
`SO_(2) +H_(2)O to H_(2)SO_(3)`
Sulphurous acid inhibits the growth of yeasts, moulds and bacteria.
Sodium metabisulphate is used as a preservative for food products such as jams, squashes, PICKLES etc.


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