Is sodium benzoate soluble in naoh, nahco3

It's slightly soluble in an aqueous solution of , and almost insoluble in an aqueous solution of NaOH.

Explanation:

Sodium benzoate comes from benzoic acid, which is a weak acid. It means that in an aqueous solution benzoic acid does not ionize easily to form the ions and

It also implies, according to the Le Châtelier's principle, that the ion tends to form the acid more easily. It can be seen in the following equation:

 ⇔  +

In an aqueous solution, the equilibrium shifts to the left, thus letting water dissolve sodium benzoate.  But why? Because water in that case would produce enough ions to facilitate the disolution of sodium benzoate. It's shown by its solubility in water at 15°C (62.78g/100mL, according to Wikipedia).

In contrast, the presence of NaOH or , both chemical species producing the ions in aqueous solution, would make the equilibrium shift to the right because it would be a higher need of ions to offset the presence of .

However, the effect of NaOH is not the same due to , because the first is a strong base and the other is a weak one. Thereby it is reasonable to think that solubility of sodium benzoate is greater in water than in and NaOH.

Solubility in water > solubility in  > solubility in NaOH.

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