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Tripotassium-sodium hexacyanoferrate(II) | |
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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: |
|
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:
100.00
g of tripotassium-sodium hexacyanoferrate(II) trihydrate
а 77.97
g of potassium hexacyanoferrate(II) trihydrate
and 29.79
g 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:
100.00
g of tripotassium-sodium hexacyanoferrate(II) trihydrate
а 9.84
g of sodium hydroxide, 13.95
g of 30%
peroxide and 81.04
g 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:
100.00
g of tripotassium-sodium hexacyanoferrate(II) trihydrate
а 103.96
g of potassium ferrocyanide trihydrate
, 9.84
g of sodium hydroxide and 41.43
g of potassium hydroxide or 97.02
g 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:
100.00
g of tripotassium-sodium hexacyanoferrate(II) trihydrate
а 9.84
g of sodium hydroxide, 41.43
g of potassium hydroxide and 70.50
g 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 wadding moistened with such solution near the crystal. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene or liquid paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.
Solubility
Temperature | g/100,00 g water | |
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(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 |
20°C293.15 K <br />68 °F <br />527.67 °R <br /> | ~26.2 | ~30.7 |
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 |
80°C353.15 K <br />176 °F <br />635.67 °R <br /> | ~65.0 | ~76.3 |
100°C373.15 K <br />212 °F <br />671.67 °R <br /> | ~71.4 | ~84.5 |
Gallery
Cyanides | |
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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) |
Double salts | |
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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) |
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