Potassium ferricyanide
General
Systematic name	Potassium hexacyanoferrate(III)
Other names	Red prussiate Prussian red
Molecular formula	K3[Fe(CN)6]
Molar mass	329.24 g/mol
Appearance	red solid
CAS number	[13746-66-2]
Properties
Density and phase	1.89 g/cm3, solid
Solubility in water	46 g/100 ml (? °C)
Melting point	? °C (? K)
Boiling point	decomp.
Structure
Coordination geometry	octahedral
Crystal structure	?
Hazards
MSDS	External MSDS
Main hazards	?
NFPA 704
Flash point	? °C
R/S statement	R: ? S: ?
RTECS number	?
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Other anions	Potassium ferrocyanide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

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. It is soluble in water and its solution shows some green-yellow fluorescence.It is manufactured by passing chlorine gas through solutions of potassium ferrocyanide. Potassium ferricyanide then separates out of the solution. Taken from the German page, this is a picture of potassium ferricyanide. ... IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... 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 unit of 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. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... 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. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... An octahedron (plural: octahedra) is a polyhedron with eight faces. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A material safety data sheet or MSDS is a form containing data regarding the properties of a particular substance. ... Worker safety and health is the prevention and reduction of the number of occupational safety and health hazards at the places of employment, providing safe and healthful working conditions. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... The flash point of a fuel is the lowest temperature at which it can form an ignitable mix with air. ... Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences, is a system of hazard codes and phrases for labeling dangerous chemicals and compounds. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed relative to vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Mass spectrometry is an analytical technique to measure the mass-to-charge ratio (m/q) of ions. ... // An ion is an atom or group of atoms with a net electric charge. ... Potassium ferrocyanide (K4Fe(CN)6·3H2O), also known as yellow prussiate of potash, is a coordination compound forming lemon-yellow monoclinic crystals at room temperature and decomposing at its boiling point. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... complex In chemistry, a complex is a structure composed of a central metal atom or ion, generally a cation, surrounded by a number of negatively charged ions or neutral molecules possessing lone pairs. ... Room temperature, in laboratory reports, is taken to be roughly 21–23 degrees Celsius (69-73 degrees Fahrenheit), or 294–296 kelvins. ... Quartz crystal 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 chlorine, Cl, 17 Chemical series halogens Group, Period, Block 17, 3, p Appearance yellowish green Atomic mass 35. ... A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture of one or more substances (the solutes) dissolved in another substance (the solvent). ... Potassium ferrocyanide (K4Fe(CN)6·3H2O), also known as yellow prussiate of potash, is a coordination compound forming lemon-yellow monoclinic crystals at room temperature and decomposing at its boiling point. ...

The compound has widespread use in blueprint drawing and in photography. Iron and copper toning involve the use of potassium ferricyanide. Potassium ferricyanide is used as a reducing agent to remove silver from negatives and positives, a process called dot etching. In color photography, potassium ferricyanide is used to reduce the size of color dots without reducing their number, as a kind of manual color correction. The compound is also used to temper iron and steel, in electroplating, dyeing wool, as a laboratory reagent, and as a mild oxidizing agent in organic chemistry. It is also used with sodium thiosulfate (hypo) to reduce the density of negative where the mixture is known as Farmer's reducer. Variants of Farmer's reducer can also be used as the intermediate step in reversal photography to dissolve the silver image produced by the first development. Modern blueprint of the French galleon La Belle. ... Photography is the process of making pictures by means of the action of light. ... 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. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic brown Atomic mass 63. ... A reducing agent is the element or a compound in a redox (reduction-oxidation) reaction (see electrochemistry) that reduces another species. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... An undated color photograph from 1905 to 1915 by Sergei Mikhailovich Prokudin-Gorskii Color photography was explored throughout the 1800s. ... Heat Treatment is a group of manufacturing techniques used to alter the hardness and toughness of a material. ... 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. ... The old steel cable of a colliery winding tower Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... Electroplating is the coating of an electrically conductive item with a layer of metal using electrical current. ... Yarn drying after being dyed in the early American tradition, at Conner Prairie living history museum. ... Wool in a shearing shed Long and short hair wool at the South Central Family Farm Research Center in Boonesville, AR Wool sheep, Royal Melbourne Show Wool is the fibre derived from the hair of animals of the Caprinae family, principally sheep and goats, but the hair of other mammals... Biochemistry laboratory at the University of Cologne. ... When purchasing or preparing chemicals, reagent describes chemical substances of sufficient purity for use in chemical analysis, chemical reactions or physical testing. ... This article is in need of attention from an expert on the subject. ... Organic chemistry is the scientific study of the structure, properties, composition, reactions, and synthesis of organic compounds that by definition contain carbon. ... Basic Information Flash point Non flammable Supplementary data page Structure and properties n, εr, etc. ... 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. ...

Potassium ferricyanide is often used in physiology experiments as a means of increasing solution's redox potential (E^o' ~ 436 mV at pH 7). Sodium dithionite is usually used as a reducing chemical in such experiments (E^o' ~ -420 mV at pH 7). Many enzymatic reactions are oxidation-reduction reactions in which one compound is oxidized and another compound is reduced. ... Sodium dithionite (aka SODIUM HYDROSULFITE) can be produced by the following reaction: 2NaHSO3 + Zn --> Na2S2O4 + Zn(OH)2 PHYSICAL STATE White crystalline powder with weak sulforous odor MELTING POINT 52C BOILING POINT Decomposes SPECIFIC GRAVITY 2. ...

See also

• Prussian blue.

A sample of prussian blue Prussian blue (Preußisch Blau, Berliner Blau) is a dark blue pigment used in paints and formerly in blueprints. ...

External links

• International Chemical Safety Card 1132
• National Pollutant Inventory - Cyanide compounds fact sheet