Question

6mg of bezoic acid equal to 6mg of sodium benzoate? If dissolve 6mg of sodium benzoate in acid, will get back 6mg of benzoic acid? Thanks.
No. 6 mg benzoic acid is not equal to 6 mg sodium benzoate.
If you dissolve 6 mg sodium benzoate in acid and you can recover 100% of the product, benzoic acid, you will have
6 mg sodium benzoate x (molar mass benzoic acid/molar mass sodium benzoate) = ? which is less than 6 mg (about 5.08 mg).

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