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Sodium nitrate is a salt that is often added to jerky, bacon and luncheon meats. Sodium nitrite, on the other hand, is a salt and antioxidant that is commonly used to cure ham and bacon. Both chemicals act as food preservatives and add a red or pink color to processed meats, among other uses.
The ability of sodium nitrite to address the above-mentioned issues has led to production of meat with improved food safety, extended storage life and improving desirable color/taste. It has the E number E250. Potassium nitrite (E249) is used in the same way.