Sodium dithionite
General
Other names	Dithionous acid, disodium salt D-Ox Hydrolin Reductone Sodium dithionite Sodium dithionite hydrate Sodium hydrosulfite Sodium sulfoxylate Sulfoxylate Vatrolite Virtex L
Molecular formula	Na2O4S2
Molar mass	174.09714 g mol−1
Appearance	White to grayish crystalline powder
CAS number	[7775-14-6]
Properties
Density and phase	2.19 g cm−3, solid
Solubility in water	soluble
Other solvents	insoluble in alcohol
Melting point	52°C (325 K)
Boiling point	Decomposes
Hazards
Toxicity	LD 50: 5 g/kg (oral in rats)
Main hazards	flammable solid
Flash Point	90 C (363 K)

Sodium dithionite (aka sodium hydrosulfite) is a toxic, white crystalline powder with a weak sulfurous odor. It is stable under most conditions, although it will decompose in hot water and in acid solutions. It can be obtained by the following reaction: A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that this article or section be merged with Solution. ... This article describes water from a scientific and technical perspective. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... The examples and perspective in this article or section may not represent a worldwide view. ... Toxic redirects here, but this is also the name of a song by Britney Spears; see Toxic (song) Look up toxic and toxicity in Wiktionary, the free dictionary. ... Quartz crystal In chemistry and mineralogy, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... Leland Stanfords horse stable, still in use Horse kept in stable A stable is a building in which livestock, usually horses, are kept. ... Decomposition is the reduction of bodies and other formerly living organisms into simpler forms of matter; and most particularly to the fate of the body, after death. ... Water is a tasteless, odorless substance that is essential to all known forms of life and is known as the universal solvent. ... For other uses, see Acid (disambiguation). ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture composed of one or more substances, known as solutes, dissolved in another substance, known as a solvent. ... A reaction is the following: In physics, a reaction (physics) is defined by Newtons third law: For every action there is an equal and opposite reaction. The idea that any given force has a pair or opposite force. ...

2NaHSO₃ + Zn → Na₂S₂O₄ + Zn(OH)₂

This compound is a water soluble salt, and can be used as a reducing agent in aqueous solutions. It is used as such in some industrial dying processes, where an otherwise water-insoluble dye can be reduced into a water-soluble alkali metal salt. The reduction properties of sodium dithionite also eliminate excess dye, residual oxide, and unintended pigments, thereby improving overall colour quality. It can also be used as a bleach, in, for instance, paper pulp, cotton, wool, and kaolin clay. A magnified crystal of a salt (halite/sodium chloride) In chemistry, a salt is any ionic compound composed of positively charged cations and negatively charged anions so that the product is neutral and without a net charge. ... A reducing agent is the element or a compound in a redox (reduction-oxidation) reaction (see electrochemistry) that reduces another species. ... Drinking water This article focuses on water as we experience it every day. ... The alkali metals are the series of elements in Group 1 (IUPAC style) of the periodic table (excluding hydrogen in all but one rare circumstance): lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). ... Commercial chlorine bleach To bleach something is to remove or lighten its color; a bleach is a chemical that can produce these effects, often via oxidation. ... Piece of A4 paper Paper is a thin material produced by the amalgamation of plant fibres, which are subsequently held together without extra binder, largely by hydrogen bonds and to a large degree by fiber entanglement. ... Cotton ready for harvest. ... See Alpaca wool, Angora wool (of rabbits) and Cashmere wool (of goats) for information about other wools. ... Kaolin Kaolinite (Aluminium Silicate Hydroxide) Kaolinite is a mineral with the chemical composition Al2Si2O5(OH)4. ... The Gay Head cliffs in Marthas Vineyard are made almost entirely of clay. ...

This chemical can also be used for water treatment, gas purification, cleaning, and stripping. It can also be used in industrial processes as a sulfonating agent or a sodium ion source. In addition to the textile industry, this compound is used in industries concerned with leather, foods, polymers, photography, and many others.

Sodium dithionite is often used in physiology experiments as a means of lowering solution's redox potential (E^o' ~ −420 mV at pH 7). Potassium ferricyanide is usually used as an oxidizing chemical in such experiments (E^o' ~ 436 mV at pH 7). Additionally, sodium dithionite is often used in soil chemistry experiments to determine the amount of iron that is not incorporated in primary silicate minerals. Hence, iron extracted by sodium dithionite is also referred to as "free iron". The strong affinity of the dithionite ion for bi- and trivalent metal cations (M²⁺, M³⁺) allows it to enhance the solubility of iron, and therefore dithionite is a useful chelating agent. Many enzymatic reactions are oxidation-reduction reactions in which one compound is oxidized and another compound is reduced. ... Potassium ferricyanide (K3[Fe(CN)6]) also known as red prussiate, Prussian red or potassium hexacyanoferrate(III), is a coordination compound that is stable at room temperature and pressure and forms ruby red crystals and powder. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ...

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