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).
Bezoic acid (C6H5COOH) and sodium benzoate (C6H5COONa) are related compounds, but they are not exactly equivalent in terms of their mass.
The molar mass of bezoic acid is approximately 122.12 g/mol, while the molar mass of sodium benzoate is approximately 144.11 g/mol. This means that 1 mole of bezoic acid is equal to 1 mole of sodium benzoate.
Given that bezoic acid has a molar mass of 122.12 g/mol, 6 mg of bezoic acid would be equal to:
(6 mg) * (1 g / 1000 mg) * (1 mol / 122.12 g) ≈ 4.91 x 10^-5 mol of bezoic acid.
Since 1 mole of sodium benzoate is also equal to 1 mole of bezoic acid, 4.91 x 10^-5 mol of sodium benzoate would have the same number of moles as 4.91 x 10^-5 mol of bezoic acid.
To convert this to mass, we can use the molar mass of sodium benzoate:
(4.91 x 10^-5 mol) * (144.11 g / 1 mol) ≈ 7.08 x 10^-3 mg of sodium benzoate.
So, if you dissolve 6 mg of sodium benzoate in acid, you will not get back exactly 6 mg of bezoic acid. Rather, you will get approximately 7.08 x 10^-3 mg of bezoic acid.
It's important to note that these calculations assume complete conversion and neglect any other factors that may affect the reaction.