Tripotassium-sodium hexacyanoferrate(II)

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   Tripotassium-sodium hexacyanoferrate(II)   
Names: tripotassium-sodium hexacyanoferrate(II)
tripotassium-sodium hexacyanoferroate
tripotassium-sodium cyanoferrate
tripotassium-sodium ferrocyanide
yellow prussiate of potash-soda
Formula: K3Na[Fe(CN)6] (anhydrous)
K3Na[Fe(CN)6] · 3H2O (trihydrate)
Molar mass: 352.237 g/mol (anhydrous)
406.282 g/mol (trihydrate)
Crystal system: rhombohedral (trihydrate)
Shapes:
https://en.crystalls.info/w/uploads/media/9/91/Prolongated_oblique_hexagonal_prism.json
Prolongated oblique hexagonal prism
https://en.crystalls.info/w/uploads/media/3/36/Oblique_rhombic_prism.json
Oblique rhombic prism

Color: yellow
red because of partial oxidation
Magnetic properties: diamagnetic
Stability: erodes (trihydrate)
Hardness: fragile
Toxicity: non-toxic

Description

Inorganic complex compound, salt of alkaline metals potassium and sodium and inorganic ferrocyanide acid. From water solutions crystallizes as trihydrate.

Precursors

Reaction between potassium and sodium hexacyanoferrates

Chemical equation:

3K4[Fe(CN)6] + Na4[Fe(CN)6] = 4K3Na[Fe(CN)6]↑


For preparation of 100.00g of tripotassium-sodium hexacyanoferrate(II) trihydrate а 77.97g of potassium hexacyanoferrate(II) trihydrate and 29.79g of sodium hexacyanoferrate(II) decahydrate is required.

Dissolve compounds in hot water apart and then mix solutions into one container with intense stirring. Cooling or evaporation of a solution will cause double salt crystallyzation. Filter precipitate and wash it wish small amount of ethanol, acetone or toluene, then filter the solution and use it for crystal growing.

Reaction between potassium ferricyanide, sodium hydroxide and hydrogen peroxide

Chemical equation:

2K3[Fe(CN)6] + H2O2 + 2NaOH = 2K3Na[Fe(CN)6] + 2H2O + O2↑


For preparation of 100.00g of tripotassium-sodium hexacyanoferrate(II) trihydrate а 9.84g of sodium hydroxide, 13.95g of 30% peroxide and 81.04g of potassium ferricyanide is required.

Add to the flask with potassium ferricyanide solution hydrogen peroxide and then add small parts of sodium hydroxide with stirring until oxide emission will stop. For purifying compound from hydroxide add large amount of cold ethanol, acetone or toluene to solution, salt will settle to the bottom in the form of fine crystals or powder. Filter precipitate and wash it with small amount of the same solvent, then filter the solution and use it for crystal growing.

Reaction between potassium ferrocyanide, hydrochloric acid and potassium and sodium hydroxide

Chemical equation:

K4[Fe(CN)6] + 4HCl = H4[Fe(CN)6]↓ + 4KCl
H4[Fe(CN)6] + 3KOH + NaOH = K3Na[Fe(CN)6] + 4H2O


For preparation of 100.00g of tripotassium-sodium hexacyanoferrate(II) trihydrate а 103.96g of potassium ferrocyanide trihydrate, 9.84g of sodium hydroxide and 41.43g of potassium hydroxide or 97.02g of 37% hydrochloric acid is required.

Add to the flask with potassium ferrocyanide solution small parts of hydrochloric acid solution and stir. The large amount of poorly soluble precipitate will form. Settle it out and wash it from soluble impurities few times.Add to flask with hot concentrated solution of sodium and potassium hydroxides small amount of that precipitate with intense stirring. Heat it to 100°C for few minutes for reaction completion and then filter out.

Reaction between prussian blue and potassium and sodium hydroxide

Chemical equation:

Fe4[Fe(CN)6]3 + 9KOH + 3NaOH = 3K3Na[Fe(CN)6] + 4Fe(OH)3↓


For preparation of 100.00g of tripotassium-sodium hexacyanoferrate(II) trihydrate а 9.84g of sodium hydroxide, 41.43g of potassium hydroxide and 70.50g of prussian blue is required.

Add to flask with prussian blue small amount of water until it will become a thick slurry. Then add small parts of diluted hydroxide solution with intense stirring. Mixture will change color from dark-blue to dark-brown, become more homogeneous and could even boils because of exothermic. Heat it to 100°C for few minutes for reaction completion, filter out a precipitation of iron hydroxide.

Influence of temperature

Growing at higher temperature gives mostly polycrystalline.

Notes

Slowly reacts with diluted sulfuric acid with poisonous hydrocyanic acid emission, so be careful. Concentrated acid decomposes it to carbon monoxide, another ones gives participate of ferrocyanide acid.

Storage conditions

For crystal storing use hermetic vessel with small amount of saturated solution at the bottom or place wadding moistened with such solution. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene, benzine or paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.

Solubility

Temperatureгр/100,00 гр water
(anhydrous)(trihydrate)
0°C273.15 K <br />32 °F <br />491.67 °R <br />~13.6~15.8
10°C283.15 K <br />50 °F <br />509.67 °R <br />~19.5~23.1
15°C288.15 K <br />59 °F <br />518.67 °R <br />~22.9~26.9
20°C293.15 K <br />68 °F <br />527.67 °R <br />~26.2~30.7
25°C298.15 K <br />77 °F <br />536.67 °R <br />~29.3~35.0
30°C303.15 K <br />86 °F <br />545.67 °R <br />~32.4~39.3
40°C313.15 K <br />104 °F <br />563.67 °R <br />~38.9~47.2
50°C323.15 K <br />122 °F <br />581.67 °R <br />~46.0~57.1
60°C333.15 K <br />140 °F <br />599.67 °R <br />~52.3~63.5
70°C343.15 K <br />158 °F <br />617.67 °R <br />~58.7~69.9
80°C353.15 K <br />176 °F <br />635.67 °R <br />~65.0~76.3
90°C363.15 K <br />194 °F <br />653.67 °R <br />~68.2~80.4
100°C373.15 K <br />212 °F <br />671.67 °R <br />~71.4~84.5
Insoluble in ethanol, methanol, acetone, diethyl ether, toluene, aniline, pyridine, ethyl acetate and isopropanol.


Gallery


Navigation


   Cyanides
Hexacyanoferroates

Potassium hexacyanoferrate(II) (K4[Fe(CN)6]) • Sodium hexacyanoferrate(II) (Na4[Fe(CN)6]) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6])

Hexacyanoferriates

Potassium hexacyanoferrate(III) (K3[Fe(CN)6])

Hexacyanocobaltates

Potassium hexacyanocobaltate(III) (K3[Co(CN)6])

Hexacyanochromates

Potassium hexacyanochromate(III) (K3[Cr(CN)6])

Nitroprussides

Sodium nitroprusside (Na2[Fe(CN)5NO])

Complexes

Cyanocobalamin (C63H88CoN14O14P)


   Sodium compounds
Salts

Sodium acetate (NaCH3COO) • Sodium bromide (NaBr) • Sodium citrate (Na3C3H5O(COO)3) • Sodium chlorate (NaClO3) • Sodium chloride (NaCl) • Sodium cyclamate (C6H12NNaO3S) • Sodium decavanadate (Na6V10O28) • Sodium ethilate (NaC2H5O) • Sodium glutamate (NaC5H8NO4) • Sodium hydrocarbonate (NaHCO3) • Sodium hydrosulfate (NaHSO4) • Sodium iodide (NaI) • Sodium metavanadate (NaVO3) • Sodium niobate (NaNbO3) • Sodium nitrate (NaNO3) • Sodium oxalate (Na2C2O4) • Sodium para-aminosalicylate (C7H6NNaO3) • Sodium perchlorate (NaClO4) • Sodium saccharinate (C7H4NaNO3S) • Sodium sulfate (Na2SO4) • Sodium sulfide (Na2S) • Sodium tetraborate (Na2B4O7) • Sodium thiosulfate (Na2S2O3) • Sodium trichloracetate (NaCCl3COO) • Sodium trioxalatoaluminate (Na3[Al(C2O4)3]) • Sodium tungstate (Na2WO4)

Double salts

Potassium-sodium tartrate (KNaC4H4O6) • Sodium-ammonium sulfate (NaNH4SO4) • Uranyl-sodium acetate (NaUО2(CH3COO)3) • Uranyl-zinc-sodium acetate (NaZn(UO2)3(CH3COO)9) • Zinc-sodium sulfate (Na2Zn(SO4)2)

Adducts

Glucose and sodium bromide complex (2C6H12O6 · NaBr) • Glucose and sodium chloride complex (2C6H12O6 · NaCl) • Urea and sodium chloride complex (CO(NH4)2 · NaCl)

Complex compounds

Sodium dicarbonatocuprate(II) (Na2[Cu(CO3)2]) • Sodium dioxalatocuprate(II) (Na2[Cu(C2O4)2]) • Sodium ethylenediaminetetraacetate-ferrate(III) (Na[Fe((OOCCH2)2N(CH2)2N(CH2COO)2)]) • Sodium hexacyanoferrate(II) (Na4[Fe(CN)6]) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Sodium hexafluorosilicate (Na2[SiF6]) • Sodium nitroprusside (Na2[Fe(CN)5NO]) • Sodium trioxalatochromate(III) (Ns3[Cr(C2O4)3]) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Sodium trioxalatoferrate(III) (Na3[Fe(C2O4)3])


   Potassium compounds
Salts

Potassium bromate (KBrO3) • Potassium bromide (KBr) • Potassium chlorate (KClO3) • Potassium chloride (KCl) • Potassium chromate (K2CrO4) • Potassium dihydrophosphate (KH2PO4) • Potassium dichromate (K2Cr2O7) • Potassium iodide (KI) • Potassium hydrofluoride (KHF2) • Potassium hydrophosphate (K2HPO4) • Potassium hydrophthalate (KC8H6O4) • Potassium metavanadate (KVO3) • Potassium nitrate (KNO3) • Potassium sulfate (K2SO4) • Potassium thiocyanate (KNCS)

Double salts

Aluminum-potassium sulfate (KAl(SO4)2) • Antimony(III)-potassium tartrate (K2Sb2(C4H2O6)2) • Chromium(III)-potassium sulfate (KCr(SO4)2) • Cobalt(II)-potassium sulfate (K2Co(SO4)2) • Copper(II)-potassium sulfate (K2Cu(SO4)2) • Indium(III)-potassium sulfate (KIn(SO4)2) • Iron(II)-potassium sulfate (K2Fe(SO4)2) • Iron(III)-potassium sulfate (KFe(SO4)2) • Lithium-potassium sulfate (KLiSO4) • Magnesium-potassium sulfate (K2Mg(SO4)2) • Magnesium-potassium sulfate-chromate (K2CrO4 · MgSO4) • Manganese(II)-potassium sulfate (K2Mn(SO4)2) • Nickel-potassium sulfate (K2Ni(SO4)2) • Potassium-sodium tartrate (KNaC4H4O6) • Vanadium(III)-ammonium sulfate (NH4V(SO4)2)

Complexes

Potassium dioxalatocuprate(II) (K2[Cu(C2O4)2]) • Potassium hexanitrocobaltate(III) (K3[Co(NO2)6]) • Potassium hexachlororhodiate(III) (K3[RhCl6]) • Potassium hexacyanocobaltate(III) (K3[Co(CN)6]) • Potassium hexacyanoferrate(II) (K4[Fe(CN)6]) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Potassium hexacyanoferrate(III) (K3[Fe(CN)6]) • Potassium hexacyanochromate(III) (K3[Co(CN)6]) • Potassium tetraiodobismuthate (К[BiI4]) • Potassium tetraiodomercurate(II) (K2[HgI4]) • Potassium trioxalatoaluminate (K3[Al(C2O4)3]) • Potassium trioxalatocobaltate(III) (K3[Co(C2O4)3]) Potassium trioxalatoferrate(III) (K3[Fe(C2O4)3]) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Potassium trioxalatochromate(III) (K3[Cr(C2O4)3])


   Double salts
Salts

Antimony(III)-potassium tartrate (K2Sb2(C4H2O6)2) • Calcium-ammonium nitrate (5Ca(NO3)2 · NH4NO3) • Cerium(III)-cobalt-manganese nitrate (3(Co,Mn)(NO3)2 · 2Ce(NO3)3) • Cerium(III)-cobalt nitrate (3Co(NO3)2 · 2Ce(NO3)3) • Cerium(III)-manganese nitrate (3Mn(NO3)2 · 2Ce(NO3)3) • Cerium(IV)-ammomium nitrate (2NH4NO3 · Ce(NO3)4) • Copper(II)-iron(II) sulfate ((Cu,Fe)SO4) • Copper-calcium acetate (CuCa(CH3COO)4) • Dipotassium-sodium trioxalatoferrate(III) (K2Na[Fe(C2O4)3]) • Iron(II)-magnesium sulfate ((Fe,Mg)SO4) • Lithium-potassium sulfate (KLiSO4) • Potassium-sodium tartrate (KNaC4H4O6) • Potassium-sodium trioxalatoferrate(III) (K5Na[Fe(C2O4)3]2) • Rubidium-gold(III)-palladium(II) chloride (2RbCl · AuCl3 · PdCl2) • Sodium-ammonium sulfate (NaNH4SO4) • Tripotassium-sodium hexacyanoferrate(II) (K3Na[Fe(CN)6]) • Uranyl-sodium acetate (NaUО2(CH3COO)3) • Uranyl-zinc-sodium acetate (NaZn(UO2)3(CH3COO)9) • Zinc-sodium sulfate (Na2Zn(SO4)2)

Categories

Alums • Tutton's salts‎


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