Sodium sulfite
IUPAC name	Sodium sulfite
Other names	Sodium sulphite Hypo clear (photography) E221
Identifiers
CAS number	[7757-83-7]
Properties
Molecular formula	Na2SO3
Molar mass	126. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 0418 g/mol
Appearance	white, granular
Density	2. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 633 g/cm³ (anhydrous) 1. 561 g/cm³ (heptahydrate)
Melting point	251. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. 8°C (525 K) (anhydrous) heptahydrate loses 7H2O at 33. 4°C
Boiling point	decomposes
Solubility in water	67. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 8 g/100 ml of heptahydrate (18°C)
Solubility in other solvents	3 g/100 ml (?°C) (heptahydrate)
Structure
Crystal structure	hexagonal (anhydrous) monoclinic (heptahydrate)
Hazards
Flash point	?°C
Related compounds
Related compounds	SO2, H2SO3, Na2SO4
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Sodium sulfite (sodium sulphite) is a soluble compound of sodium. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. In Mineralogy and Crystallography, a crystal structure is a unique arrangement of Atoms in a Crystal. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air Sulfurous acid is the Chemical compound with the formula H2SO3 Sodium sulfate is the Sodium salt of Sulfuric acid In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly Sodium (ˈsoʊdiəm is an element which has the symbol Na( Latin natrium, from Arabic natrun) atomic number 11 atomic mass 22 Its chemical formula is Na₂SO₃. Sodium (ˈsoʊdiəm is an element which has the symbol Na( Latin natrium, from Arabic natrun) atomic number 11 atomic mass 22 Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the It has a molecular weight of 126. 04. It is a product of SO₂ scrubbing, a part of the flue gas desulfurization process. Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Flue gas is Gas that exits to the atmosphere via a Flue, which is a pipe or channel for conveying exhaust gases from a fireplace oven Furnace, Boiler Hydrodesulfurization (HDS is a Catalytic chemical process widely used to remove Sulfur (S from Natural gas and from refined petroleum products It is also used as a preservative to prevent dried fruit from discoloring, and for preserving meats, and is used in the same way as sodium thiosulfate to convert elemental halides to their respective acids, in photography and for reducing chlorine levels in pools. A preservative is a natural or synthetic chemical that is added to products such as foods pharmaceuticals paints biological samples wood etc Dried fruit is fruit that has been dried, either naturally or through use of a machine such as a Food dehydrator. Sodium thiosulfate ( Na 2 S 2 O 3 is a colorless Crystalline compound that is more familiar as the Pentahydrate A halide is a Binary compound, of which one part is a Halogen Atom and the other part is an element or radical that is less Photography (fә'tɒgrәfi or fә'tɑːgrәfi (from Greek φωτο and γραφία is the process and Art of recording pictures by means of capturing Chlorine (ˈklɔriːn from the Greek word 'χλωρóς' ( khlôros, meaning 'pale green' is the Chemical element with Atomic number 17 and

Applications

Sodium sulfite is primarily used in the pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, in the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions, in the textile industry as a bleaching, desulfurizing and dechlorinating agent and in the leather trade for the sulfitization of tanning extracts. Sodium thiosulfate ( Na 2 S 2 O 3 is a colorless Crystalline compound that is more familiar as the Pentahydrate It is used in the purification of TNT for army use. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of sodium thiosulfate. Sodium thiosulfate ( Na 2 S 2 O 3 is a colorless Crystalline compound that is more familiar as the Pentahydrate It is used in other applications, including ore flotation, oil recovery, food preservatives, making dyes, and detergent. It forms a bisulfite adduct with aldehydes, and with ketones forms a sulfonic acid. See also Adduction, one of the Anatomical terms of motion. An adduct (from the Latin adductus, "drawn toward" is An aldehyde is an organic compound containing a terminal Carbonyl group. A ketone (pronounced as key tone) is either the Functional group characterized by a Carbonyl group (O=C linked to two other Carbon atoms or Sulfonic acid is an unstable Acid with the formula H-S(=O2-OH It is used to purify or isolate aldehydes and ketones.

Descriptive chemistry

Sodium sulfite is decomposed by even weak acids, giving up sulfur dioxide gas.

Na₂SO₃ + 2 H⁺ → 2 Na⁺ + H₂O + SO₂

A saturated aqueous solution has pH of ~9. Solutions exposed to air are eventually oxidized to sodium sulfate. Sodium sulfate is the Sodium salt of Sulfuric acid If sodium sulfite is allowed to crystallize from aqueous solution at room temperature or below, it does so as a heptahydrate. The heptahydrate crystals effloresce in warm dry air. Effloresce redirects here for the album by Oceansize see Effloresce (album. Heptahydrate crystals also oxidize in air to form the sulfate. The anhydrous form is much more stable against oxidation by air. ^[1]

References

1. ^ Merck Index of Chemicals and Drugs, 9th ed. monograph 8451

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