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Sodium benzoate is a salt of a weak acid (benzoic acid). In water, sodium benzoate hydrolyses to form a strong base (sodium hydroxide) and benzoinc acid. This is an equilibrium reaction. Benzoic acid being a weak acid is only partially ionized in water whilst sodium hydroxide is fully ionoized. The resultant solution is therefore alkaline since the concentration of hydroxyl ions is greater than the concentration of hydrogen ions. The addittion of hydrochloric acid results in an acid base reaction formating a salt (sodium chloride). Since the addition of hydrochloric acid removes the sodium hydroxide, it forces the equilibrium to the right forming more benzoic acid which is precipitated.

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Q: Why does sodium benzoate react with hydrochloric acid?
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What is formed when you react benzamide with hydrochloric acid and sodium hydroxide?

The products are sodium benzoate and ammonia gas.


Is sodium carbonate soluble in hydrochloric acid?

Sodium carbonate react with hydrochloric acid !


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It is added to protonate the sodium benzoate.


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an acid will react easily with base, not with another acid (generally) so sulphuric acid reacts with sodium hydroxide (a base) and not with hydrochloric acid


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when any carbonates react with hydrochloric acid will be i.e. sodium carbonate+hydrochloric acid =sodium chloride


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Sodium benzoate (ionic) and water (covalent)


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Sodium chloride doesn't react with hydrocholric acid.


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If Sodium hydroxide and Hydrochloric acid are combined they will react and produce water and Sodium chloride.NaOH + HCl = NaCl + H2O