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Sodium cyanide is an organic compound composed of sodium, carbon and nitrogen.
Na + C + N ® NaCN
When sodium cyanide reacts with Fe3+ ions they react with sodium ferrocyanide giving Prussian blue or green colour due to the formation of ferric ferrocyanide
2NaCN + FeSO4 ¾® Na2 SO4+ Fe(CN)2
Fe(CN)2 + 4NaCN ¾® Na4 [Fe(CN)6]
Sodium ferrocyanide
3Na4[Fe(CN)6]+ 4Fe3+ ¾® Fe4 [Fe(CN)6]3 + 12Na+
Ferric ferrocyanide
(Prussian blue)
Thanks & Regards,
Vasantha Sivaraj,
askIITians faculty.
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