Sodium sulfite (Na2SO3) is a white, water-soluble, crystalline solid through a sulfurous, braided taste. The decomposes once heated. That is generally easily accessible f in powder, crystalline, and tablet forms.

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Sodium sulfite is yet one more dechlorinating agent widely offered by utilities. It is generally accessible in flour form. In addition, some service providers manufacture in tablet computer form. Sodium sulfite is slightly alkaline in nature. Salt sulfite is a reducing agent and also is report to scavenge more oxygen than sodium thiosulfate.

Food sector used salt sulfite to aid the preservation of the new appearance that food products. In numerous drugs, the is likewise an element that helps to keep their potency and stability. salt sulfite has actually been approved by the FDA together a fresh low regulatory priority animal drug.

What is sodium Sulfite?

Sodium sulfite is an inorganic salt through the chemical formula Na2SO3. it is one ionic link containing 2 sodium cations (Na+) and one sulfite anion (SO32-). A saturated solution of salt sulfite in water is mildly basic with an approximate pH value of 9. such a solution have the right to undergo crystallization to yield heptahydrate crystals the Na2SO3.


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Sodium Sulfite Powder


In its anhydrous kind (image detailed above), salt sulfite is a white solid. The primary difference between anhydrous Na2SO3 and its heptahydrate is the loved one stability of the anhydrous form towards oxidation. Na2SO3.7H2O is gradually oxidized through atmospheric oxygen, offering rise to the matching sulfate.

Sodium Sulfite Structure

In a salt sulfite molecule, there exist two ionic bonds between the sodium cations and the sulfite anion. The structure of a Na2SO3 molecule is illustrated below.


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Sodium Sulfite Structure


Each salt ion stop a charge of +1. Top top the various other hand, the -2 fee on the sulfite ion is delocalized because of resonance, bring about a partial charge of -⅔ on every oxygen atom. The overall fee on a Na2SO3 molecule is zero.

Sodium Sulfite Preparation

1. In laboratories, salt sulfite is usually prepared indigenous the reaction between gaseous sulfur dioxide (SO2) and also sodium hydroxide (NaOH). The chemical equation because that this reaction is offered by

SO2 + 2NaOH → Na2SO3 + H2O

The depletion the the NaOH reactant have the right to be detect via the enhancement of a few drops of concentrated H2SO4, resulting in the liberation that SO2 gas.

2. Industrially, Na2SO3 is produced from the reaction between sulfur dioxide and sodium lead carbonate solution. Initially, salt bisulfite (NaHSO3) is formed. This compound now reacts through sodium lead carbonate or sodium hydroxide to yield the salt sulfite product. The reaction can be generalised to:

Na2CO3 + SO2 → Na2SO3 + CO2

Properties of salt Sulfite

Some essential physical and chemical nature of salt sulfite are listed in this subsection.

Physical Properties of sodium Sulfite

The molar fixed of this compound is 126.043 grams per mole.Anhydrous sodium sulfite exists together a white, odourless heavy which has actually a density of 2.633 grams per cubic centimetre.The heptahydrate form has a fairly lower thickness of 1.561 g/cm3.When heated come 306.5K (33.4oC), the heptahydrate experience dehydration. The anhydrous form melts at a temperature that 500oSodium sulfite walk not have actually a certain boiling point since it tends to decompose in ~ high temperatures.It is moderately dissolve in water, that solubility coincides to 27g/100mL.The crystal framework of anhydrous Na2SO3 is hexagonal vice versa, the heptahydrate crystals have a monoclinic structure.

Chemical Properties of sodium Sulfite

Upon call with solid or weak acids, Na2SO3 experience decomposition, liberating gaseous sulfur dioxide.Sodium sulfite reacts through aldehydes to yield a bisulfite adduct. However, sulfonic mountain are created from that reaction through ketones.Solutions of sodium sulfite are oxidized through atmospheric oxygen, yielding salt sulfate.

Uses of salt Sulfite

Although its main applications lie in the pulp and document industry, Na2SO3 has countless other applications. A few such applications are listed below.

This compound is frequently used come prevent the discolouration the dried fruits since it have the right to act as a preservative.It is also used in swimming pools to decrease the chlorine level in the water.In boiler systems, this compound acts together an oxygen scavenger to protect the system from pitting corrosion. Therefore, the water fed to boilers is frequently treated through sodium sulfite.The textile market makes substantial use the Na2SO3 for bleaching, dechlorinating and also desulfurizing purposes.Sodium sulfite is also used in the process of purifying trinitrotoluene (TNT) in bespeak to make it right for military use.This link is also critical component in the preparation of salt thiosulfate.

Sodium Sulfite health Hazards

Sulfites space compounds include the sulfite ion, most frequently in combination with salt (sodium sulfite) or potassium (potassium sulfite). Sulfites release the irritant gas sulfur dioxide, i beg your pardon acts together a preservative and also bleaching agent. And also occurring normally in part foods and in the human body, sulfites are added to certain foods come act as a preservative as lock inhibit microbial growth, maintain food colour and also increase shelf life.

Foods come which sulfites room commonly included include wines, beer and also dried fruit. Castle are additionally used to bleach food starches, such together potato starch and also are used in the manufacturing of part food packaging products such as cellophane.

Allergenicity of sodium Sulfite

It is quiet unclear why sulfites elicit an allergy reaction in some people yet not in others. Sulfur dioxide is an irritant gas and also so reflex convulsion of the airways has actually been proposed as one possible mechanism, as the majority of sulfite allergic individuals exhibit asthma-like symptoms.


Sodium sulfite is offered as a sulfonation and also sulfomethylation certified dealer in the chemical production industry. That is additionally used for the salt thiosulfate production. This compound has actually several other crucial applications, including froth ores flotation, oil recovery, food preservatives, and colouring.


Sodium sulphite, Na2SO3, is a salt made from the neutralization reaction in between a strong base (sodium hydroxide) and a weak acid (sulphurous acid). Its aqueous equipment is, therefore, distinctly basic in nature, v a pH value slightly better than 7.


Sodium sulfite is one ionic link which crystallizes in a hexagonal decision lattice in its anhydrous form. However, this compound crystallizes in a monoclinic lattice when it is in its heptahydrate form.


Sodium sulfite deserve to be ready by the treatment v sulfur dioxide that a sodium hydroxide solution. The Na2SO3 at first precipitates together a yellow solid when performed in warmth water. The solid dissolves with more SO2 to give the disulfite, i m sorry crystallizes as it cools down.

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For decades, sulfites have actually been used as food additives mainly to enhance taste and also maintain freshness. But these sulfur-based compounds likewise occur naturally in foods, such as fermented beverages and wines. Because that a variety of drugs, castle are frequently used as a preventive to help improve shelf life.