The final compound which is responsible for Prussian blue colour in Lassaigne’s test for nitrogen
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So, $$Fe_4(Fe(CN)_6]_3$$ is responsible for prussian blue colour obtained during the test of Nitrogen and Lassaigne test.
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The final compound which is responsible for Prussian blue colour in Lassaigne’s test for nitrogen is Iron (III) hexacyanoferrate (II).
- In Lassagne's test, sodium cyanide first reacts with iron sulphate and forms sodium hexacyanoferrate (II).
6 CN⁻ + Fe²⁺ → [Fe(CN)₆]⁴⁻
- On heating with conc. H2SO4, some Fe²⁺ ions are converted into Fe³⁺ ions.
- These Fe³⁺ ions react with sodium hexacyanoferrate (II) to produce Iron (III) hexacyanoferrate (II) which is also known as ferriferrocyanide.
3 [Fe(CN)₆]⁴⁻ + 4 Fe³⁺ → Fe₄[Fe(CN)₆]₃
- This end product is Prussian blue in colour.
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