Everything about Potassium Ferrocyanide totally explained
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Potassium ferrocyanide, also known as yellow prussiate of potash or potassium hexacyanoferrate(II), is a
coordination compound of formula K
4[Fe(CN)
6]·3H
2O, which forms lemon-yellow
monoclinic crystals at
room temperature, and which decomposes 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 (HCN) gas. The resulting HCN gas boils at 26 °
C and, being
lighter than air (with a gaseous density of 0.94), quickly
evaporates clear of the release point. Potassium ferrocyanide itself is only slightly toxic.
On
February 20,
2002 four
Moroccans were arrested while in possession of detailed maps of the
United States embassy in
Rome and the Rome water supply network, as well as four kilograms of potassium ferrocyanide.
When combined with ferric (
iron) salts, potassium ferrocyanide forms the pigment
Prussian blue.
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