An Inorganic Compound Containing Sulfur, Sodium, And Oxygen, Sodium Metabisulfite Is Also Known As Sodium Pyrosulfite Or Disodium

 

Sodium Metabisulfite

Sodium Metabisulfite (SMBS), a sulfite with the European food additive number E223, is one of the sulfites that can be employed as a preservative, antioxidant, and bleaching agent in food. It serves as a reducing agent and is frequently used to preserve fresh and dried fruits, vegetables, and wines.

Sulfur dioxide and sodium carbonate can combine to produce Sodium Metabisulfite. The reaction equation is as follows: Na2SO3 + SO2 = Na2S2O5

The production procedure developed by Solvay is as follows: Creating a mixed solution of sodium bisulfite and sodium sulfite through the reaction of sodium carbonate (Na2CO3) and sodium bisulfite (NaHSO3) solutions (Na2SO3).

Na2CO3+2NaHSO3 = Na2SO3+H2O + CO2 is the reaction equation

To transform sodium sulfite into sodium bisulfite and acquire the dissolved sulphur dioxide, add more sulphur dioxide (SO2) to the aforementioned solution. Na2SO3, H2O, and SO2 react to form NaHSO3.

Add an alkali component, such as sodium carbonate, sodium hydroxide, sodium sulfite, or combinations, to the dissolved sulphur dioxide to produce sodium bisulfite. Na2CO3+H2O+SO2=2NaHSO3+CO2 is the reaction equation.

By chilling the aforementioned sodium bisulfite solution, two sodium bisulfite molecules combine to generate Sodium Metabisulfite (Na2S2O5), which is then purified and dried to make crystals or powder. Equation of reaction: Na2S2O5 + H2O = 2NaHSO3.

Crystals or powder made of white crystals. If exposed to air and moisture, slowly oxidises to Na2SO4 (sodium sulphate) and releases sulphur dioxide (SO2) gas. The interaction with acid also results in the emission of SO2. It is soluble in water, and its solubility rises with temperature, reaching 81.7g/100ml at 100°C from 54g/100ml at 20°C. When this substance is dissolved in water, sodium bisulfite (HSO3) is produced, and the resulting aqueous solution has an acidic PH range of 4.0–5.5 (10% aqueous solution).

The sulphur atom in Sodium Metabisulfite has a positive valence of 4, with a maximum valence of 6, making it a potent reducing agent that can react with oxidising agents. This is the process that makes sodium metabisulfite a multipurpose substance that can be utilised in agricultural food products, wine, and other applications as a preservative, antioxidant, and bleaching agent.

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