Question

why salt is used as a preservative in food​

Answer 1

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Salt is effective as a preservative because it reduces the water activity of foods. The water activity of a food is the amount of unbound water available for microbial growth and chemical reactions. Salt’s ability to decrease water activity is thought to be due to the ability of sodium and chloride ions to associate with water molecules (Fennema, 1996; Potter and Hotchkiss, 1995).

Answer 2

Answer:

as it removes water from food items by the process of exosmosis which prevents it from getting spoiled. for example in pickling of mango, lots of spices and salt is added to keep it safe for long time

hope it helps