Potassium ferrocyanide: Difference between revisions
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'''Potassium ferrocyanide''' (K<sub>4</sub>Fe(CN)<sub>6</sub>·3H<sub>2</sub>O), also known as yellow prussiate of potash or potassium hexacyanoferrate(II), is a [[complex (chemistry)|coordination compound]] forming lemon-yellow [[monoclinic]] [[crystal]]s at [[room temperature]] and decomposing at its boiling point. It is insoluble in [[ethanol|alcohol]] but a litre of water can dissolve just under three hundred [[gram]]s of the crystals, and the solution can react with acid to release [[hydrogen cyanide]] gas. The resulting hydrogen cyanide (HCN) boils at 26 °[[Celsius|C]] and, being slightly [[lighter than air]], quickly [[evaporation|evaporates]] clear of the release point. |
'''Potassium ferrocyanide''' (K<sub>4</sub>Fe(CN)<sub>6</sub>·3H<sub>2</sub>O), also known as yellow prussiate of potash or potassium hexacyanoferrate(II), is a [[complex (chemistry)|coordination compound]] forming lemon-yellow [[monoclinic]] [[crystal]]s at [[room temperature]] and decomposing at its boiling point. It is insoluble in [[ethanol|alcohol]] but a litre of water can dissolve just under three hundred [[gram]]s of the crystals, and the solution can react with acid to release [[hydrogen cyanide]] gas. The resulting hydrogen cyanide (HCN) boils at 26 °[[Celsius|C]] and, being slightly [[lighter than air]], quickly [[evaporation|evaporates]] clear of the release point. |
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Potassium ferrocyanide is also one of two compounds present in [[ferroxyl indicator solution]] (along with [[phenolphthalein]]) which turns blue ([[Prussian blue]]) in the presence of Fe<sup>3+</sup> ions, and which can therefore be used to detect rust. It is possible to calculate the number of moles of Fe<sup>3+</sup> ions by using a [[colorimeter]], because the very intense color of [[Prussian blue]] Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub>. |
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On [[February 20]], [[2002]] four [[Morocco|Moroccans]] were arrested while in possession of detailed maps of the [[United States]] embassy in [[Rome]], the Rome water supply network, and four kilograms of potassium ferrocyanide. |
On [[February 20]], [[2002]] four [[Morocco|Moroccans]] were arrested while in possession of detailed maps of the [[United States]] embassy in [[Rome]], the Rome water supply network, and four kilograms of potassium ferrocyanide. |
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Revision as of 22:48, 20 September 2006
Potassium ferrocyanide (K4Fe(CN)6·3H2O), also known as yellow prussiate of potash or potassium hexacyanoferrate(II), is a coordination compound forming lemon-yellow monoclinic crystals at room temperature and decomposing at its boiling point. It is insoluble in alcohol but a litre of water can dissolve just under three hundred grams of the crystals, and the solution can react with acid to release hydrogen cyanide gas. The resulting hydrogen cyanide (HCN) boils at 26 °C and, being slightly lighter than air, quickly evaporates clear of the release point.
On February 20, 2002 four Moroccans were arrested while in possession of detailed maps of the United States embassy in Rome, the Rome water supply network, and four kilograms of potassium ferrocyanide.
See also
External links
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