What is sodium benzoate?


Question by: Fabiano Carbone | Last updated: January 7, 2022

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Sodium benzoate is the sodium salt of benzoic acid. At room temperature it appears as an odorless white solid. It can be produced by reacting sodium hydroxide with benzoic acid. It is a widely used food preservative, which is indicated with the initials E211.

Where is sodium benzoate found?


The substance is found in carbonated drinks, aloe juice, fruit juices, olive paste, mayonnaise and caviar often combined with citrus substances.

What is sodium benzoate used for?

Sodium benzoate in cosmetics

This ingredient is widely used in cosmetics as an ecological preservative. In fact, Sodium Benzoate allows optimal maintenance of the product and has antibacterial and antifungal properties.

Where is benzoic acid found?

Benzoic acid, in nature, is found in free or combined form; it can be obtained from natural sources, in fact for example it is present in benzoin (see photo), in balsam of Peru and Tolù, in other balsams, in plums, in yogurt, but in practice it is produced by chemical synthesis starting from anhydride phthalic.

How is benzoic acid obtained?

Benzoic acid is mainly produced by reacting toluene with oxygen at a temperature of 200 ° C and using cobalt and manganese salts as catalysts; other oxidizing agents can also be used, such as potassium permanganate, nitric acid or chromic anhydride.

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How is sulfuric acid produced?

Sulfuric acid is produced by oxidizing sulfur dioxide (SO2) to sulfuric anhydride (SO3) and absorbing with water. The starting product, sulfur dioxide (SO2) is now obtained directly from Sulfur (coming from oil refining) which is burned with air.

How does benzoic acid dissociate?

Benzoic acid is a crystalline compound that is not very soluble in cold water, more so in hot water; it is soluble in organic solvents. It melts at 122 ° C and boils at 250 ° C; it is stable up to 370 ° C, but above this temperature it begins to decompose into benzene and CO2, also providing phenol (0.2-0.8%).

How does sodium benzoate dissociate?

Sodium benzoate is a salt and as such is completely dissociated in aqueous solution. The sodium ion has negligible acid properties, being the conjugate acid of a strong base (sodium hydroxide).

What is potassium sorbate used for?

It is used in the food industry as a preservative in fruit-based preparations such as compotes and jams and as a fungicide for the preservation of cheeses. As a preservative it is also used in cosmetics in the preparation of creams, lotions and deodorants.

How is Benzyl benzoate used?

Benzyl Benzoate 25% Lotion: Apply Benzyl Benzoate 25% Lotion for three consecutive days, then rinse. Reapply to your hands every time you wash them with soap.

How is the hydrolysis constant calculated?

The constant relating to these types of equilibria is given by K.to = Kw/ Kb being Kb is the dissociation constant of the weak base.

How is sodium hydroxide made?

Sodium hydroxide is mainly obtained by electrolysis of brines (sodium chloride solutions) together with gaseous hydrogen and chlorine.

When is Benzene a Substituent?

Phenyl, as mentioned, is a residue that derives from benzene by eliminating a hydrogen atom. It must be understood as a substituent of another molecule. … if an ethyl group (-CH2-CH3) is bound on the free bond of phenyl C6H5- then we have ethylbenzene C6H5-CH2-CH3.

What is the acidity of carboxylic acids due to?

The marked acidity of carboxylic acids is due to two factors: the resonance effect and the inductive effect.

What elements form sulfuric acid?

sulfuric, acid Chemical compound containing hexavalent sulfur, of formula H2SO4. … is based on the oxidation of sulfur dioxide SO2 anhydride s. SO3 and in the subsequent combination of this with water.

How does sulfuric acid work?

In contact with metals it reacts, in particular if diluted with water, the resulting formation is therefore flammable hydrogen gas, with serious risk of explosion. Sulfuric acid is a strong oxidant that enhances combustion but does not burn by itself because it is not combustible.

What do you do with sulfuric acid?

Sulfuric acid is used in a myriad of industrial applications such as the production of fertilizers and insecticides, in the treatment of uranium, in the production of detergents, detergents, colors, plastics, explosives and artificial textile fibers such as rayon and viscose, for the refining some …

What corrodes caustic soda?

Caustic soda attacks metallic materials, particularly when it comes to aluminum, magnesium, zinc and other alloys that contain them. Not only can caustic soda be corrosive to metals, it can also cause severe burns and eye and skin injuries.

How to extract sodium?

It is obtained from the sea water in which it is contained in large quantities (brackish water contains on average from 3.3 to 3.7% of salts and the dry residue contains about 30% of sodium chloride).

What happens if we add sodium hydroxide to the water?

Typical reactions of sodium hydroxide

Sodium hydroxide reacts with acids to form the corresponding salts and water (neutralization reaction). The reaction is exothermic and therefore releases heat. Such reactions can be used in titrations.

What are the salts that give hydrolysis?

Examples of salts with saline hydrolysis

Instead other salts, such as NaNO2NH4NO3 and CH3COONH4they give saline hydrolysis because their ions come from weak acids and / or bases. From the saline hydrolysis of NaNO2 the weak acid HNO is obtained2 and OH ions; hence the NaNO solution2 it is weakly basic.

What is Saline Hydrolysis?

Salt hydrolysis is the reaction of a salt in water. More precisely, in chemistry we speak of saline hydrolysis when a salt modifies the pH of an aqueous solution. That is when the ions of a salt in water are totally or only partially re-associated in molecules.

What is the degree of hydrolysis?

The term hydrolysis also indicates the reaction that the ions deriving from weak acid or base undergo: these react with water, partly originating the starting weak electrolyte and causing a change in pH.


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