Sodium benzoate is a substance which has the chemical formula C6H5COONa. It is a widely used food pickling agent, with an E number of E211. It is the sodium salt of benzoic acid and exists in this form when dissolved in water. While it shows some activity up to pH 6 (about 1.55%), it is most active at pH 3 (94%). It can be produced by reacting sodium hydroxide with benzoic acid. : 532-32-1. As benzoic acid, it is considered to be primarily an anti-fungal, but it shows some activity against bacteria. Sodium Benzoate is the inactive salt of benzoic acid. Benzoic acid is very pH dependent. Benzoic acid and sodium benzoate are used as preservatives in beverages, fruit products, chemically leavened baked goods, and condiments, preferably in a pH range below 4.5. International Programme on Chemical Safety's Concise International Chemical Assessment Documents. Sodium benzoate is deemed safe, and people generally don’t exceed the ADI of 0–2.27 mg per pound (0–5 mg per kg) of body weight, though some individuals may be more sensitive. CAS No. It is soluble in water where it converts to benzoic acid, its active form, at a low pH.

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