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Sodium ferrocyanide is an inorganic compound with the molecular formula Na4Fe(CN)6. Also known as sodium yellow blood salt, it is bright yellow crystals.
It is easily soluble in water, hardly soluble in alcohol, and has no fixed melting point. It starts to be dehydrated when heated to 50°C. It is anhydrous at 81.5°C and decomposes at 435°C. The decomposition products are nitrogen, iron carbide and sodium cyanide.
The reaction of sodium ferrocyanide with silver nitrate will produce a milky white silver ferrocyanide precipitate.
Sodium ferrocyanide reacts with ferrous sulfate to form a white precipitate of ferrous ferrocyanide, which is then oxidized to form cyanide: Prussian blue ferrous.
Under the action of oxidants, sodium hexacyanoferrate will be oxidized to form sodium ferricyanide.
When sodium hexacyanoferrate (4-) burns intensively, nitrogen is completely separated and liberated to produce sodium cyanide and iron carbide.
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