Question

What conclusion would you draw if the lassaigne's extract gives a blood red color with fecl3?

Answer 1

Hello,

In Lassaigne’s solution, Ferric Chloride (FeCl3) reacts with Sodium thiocyanate to give Ferric thiocyanate [Fe(CNS)3] which is blood red.

The test is usually used as a confirmatory test for organic compounds containing Nitrogen and Sulfur Compounds(essential amino acids). Blood red color indicates the formation of Ferric thiocyanate.

Hope it helped.