iit jee chemistry can anyone explain to me in simple terms what are kjeldal and lassaigne's test for nitrogen?

kjeldal method

i am explaining the method in short diagram part u can look for ur self

the compd containing N( nitrogen ) is heated with sulphuric acid , to get convetrted into ammonium sulphate which is then distilled with sodium hydroxide solution to form ammonia , the evolved ammonia is made to pass into excess of known amt of standard acid solution , the amount of ammonia formed in the above reaction reacts with equivalent amount of standard acid , and then the excess acid left is estimated by titrating against standard alkali solution . this is back titration and from this reading the amount of nitrogen in the given organic compound can be estimated.

the rreactions are

C+H+S gives in presence of H2SO4 CO2+H2O+SO2

N in presence of H2SO4 gives (NH4)2SO4

lassaigne's test for nitrogen

the organic compound is first convertedinto soluble extract form . the organic compound containing N is fused with sodium metal and plunged into dis water , the contents are then boiled to form its sodium extract or lassaigne's extract to this extract small amount of ferrous sulphate solution is added warmed a few drops of ferric chloride is then added and the resulting solution is acidified with dil HCl . the appearance of prussian blue color shows the presence of N

the reactions

Na+C+N --NaCN

FeSO4+2NaCN ----Fe(CN)2 +NaSo4

Fe(CN)2+4NaCN ------Na4[Fe(CN)6] sodium ferrocynadie

3Na4[Fe(CN)6]+6FeCl3-Fe4[Fe(CN)6]3 +12NaCl