| Identification | More | [Name]
Potassium ferrocyanide trihyrate | [CAS]
14459-95-1 | [Synonyms]
FERROCYANPOTASSIUM TRIHYDRATE
POTASSIUM FERROCYANIDE
POTASSIUM FERROCYANIDE(+2)TRIHYDRATE
POTASSIUM FERROCYANIDE 3H2O
POTASSIUM FERROCYANIDE 3-HYDRATE
POTASSIUM FERROCYANIDE(II) HYDRATE
POTASSIUM FERROCYANIDE(II) TRIHYDRATE
POTASSIUM FERROCYANIDE TRIHYDRATE
POTASSIUM FERROCYANIDE TRIHYRATE
POTASSIUM HEXACYANOFERRATE(+2)TRIHYDRATE
POTASSIUM HEXACYANOFERRATE(II)
POTASSIUM HEXACYANOFERRATE(II)-3-HYDRATE
POTASSIUM HEXACYANOFERRATE(II) TRIHYDRATE
POTASSIUM PRUSSIATE, YELLOW
YELLOW PRUSSIATE OF POTASH
YELLOW PRUSSIATE TRIHYDRATE
Potassiumferrocyanide,trihydr
Potassiumhexacyanoferratetrihydrate
POTASSIUM HEXACYANOFERRATE(II)-3-HYDRATE PURE
POTASSIUM HEXACYANOFERRATE(II) TRIHYDRATE, REAGENTPLUS TM, >= 99% | [EINECS(EC#)]
237-722-2 | [Molecular Formula]
C6H6FeK4N6O3 | [MDL Number]
MFCD00167023 | [Molecular Weight]
422.39 | [MOL File]
14459-95-1.mol |
| Chemical Properties | Back Directory | [Appearance]
pale yellow solid | [Melting point ]
70 °C(lit.)
| [density ]
1.85
| [storage temp. ]
Store at RT. | [solubility ]
H2O: 0.5 M at 20 °C, clear, yellow
| [form ]
fine crystals
| [color ]
Yellow | [Specific Gravity]
1.85 | [Odor]
Odorless | [PH]
9.5 (100g/l, H2O, 20℃)(anhydrous substance) | [PH Range]
8 - 10 at 211 g/l at 25 °C | [Stability:]
Stable. Incompatible with oxidizing agents, stong acids (may generate very toxic HCN). Not combustible. | [Water Solubility ]
270 g/L (12 ºC) | [Merck ]
14,7631 | [Exposure limits]
ACGIH: TWA 1 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 1 mg/m3 | [Uses]
Potassium ferrocyanide is a yellow crystal also known as
yellow prussiate of potash. It was made by stirring hot potassium
carbonate with wool or horn clippings with an iron rod.
It is soluble in water 1:4 but not in alcohol. Potassium ferrocyanide
was used as a developer for some iron processes and
as an additive for alkaline pyro developers. | [CAS DataBase Reference]
14459-95-1(CAS DataBase Reference) |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R32:Contact with acids liberates very toxic gas.
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed . | [Safety Statements ]
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S36:Wear suitable protective clothing . | [RIDADR ]
1588 | [WGK Germany ]
2
| [RTECS ]
LJ9219000 | [F ]
8 | [TSCA ]
Yes | [HS Code ]
28372000 | [Toxicity]
LD50 orally in Rabbit: 3613 mg/kg |
| Hazard Information | Back Directory | [Chemical Properties]
pale yellow solid | [Application]
Potassium hexacyanoferrate(II) trihydrate may be used in the following processes:
Preparation of Carrez I solution.
Milk sample preparation for gold nanoparticles (AuNPs) based colorimetric detection of melamine.
Preparation of ferrocyanide/ferricyanide reaction, a redox pair solution for electrochemical testing. | [Preparation]
Potassium hexacyanoferrate(II), K4Fe(CN)6·3H20, is obtained commercially from gasworks
spent oxide (which contains Prussian blue) by treatment with lime and subsequent
treatment of the solution with a soluble potassium salt ; the less soluble potassium hexacyanoferrate(II) can be crystallized from this mixture. In the laboratory it is readily
prepared by treating aqueous iron(II) sulphate with an excess of potassium cyanide ; the
initially precipitated iron(II) cyanide dissolves upon boiling in the excess of potassium
cyanide solution and the ferrocyanide crystallizes on cooling.
| [General Description]
Potassium hexacyanoferrate(II) trihydrate, commonly known as potassium ferrocyanide, is a commonly used anticaking agent. Its cytotoxic and genotoxic effect has been evaluated. The growth of chemical garden in aqueous potassium hexacyanoferrate solution droplets on a superhydrophobic surface has been reported. The inhibition efficiency of potassium ferrocyanide in phosphoric acid solution against the corrosion of mild steel has been investigated. | [Purification Methods]
The anhydrous salt is prepared by drying at 110o over P2O5 in a vacuum desiccator. To obtain the trihydrate, it is necessary to equilibrate the salt in a desiccator over a saturated aqueous solution of sucrose and NaCl. It can also be precipitated from a saturated solution at 0o by adding an equal volume of cold 95% EtOH, setting aside for several hours, then centrifuge and wash with cold 95% EtOH. It is finally sucked air dry with water-pump vacuum. The anhydrous salt is obtained by drying the hydrate in a platinum boat at 90o in a slow stream of N2 [Loftfield & Swift J Am Chem Soc 60 3083 1938]. | [Structure and conformation]
The trihydrate is diamagnetic
and dimorphic existing in monoclinic (pseudotetragonal) and tetragonal forms. Its infrared spectrum in solution shows a single ν(C≡ N) at 2044 cm-1, but in the solid state a large
number of bands are observed160; ν(Fe-C) occurs at 416cm-1. White, anhydrous
K4Fe(CN)6 is obtained by dehydrating the trihydrate at 100°. |
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