Basic Radicals

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Edited at 2020-09-28 14:11:38

Basic Radicals

Ba2+

salt and naoh -> no gas -> zero group absent

aq ext add dil HCl -> no ppt -> 1 gp. absent

above soln add h2s gas -> no ppt -> 2 gp. absent

boil above soln add conc. hno3 and nh4cl and nh4oh ->no ppt-> 3 gp. absent

pass h2s gas -> no ppt -> fourth gp. absent

add ammonium carbonate -> white ppt -> 5 present(Ba2+)

filter ppt and dissolove in HCl and add k2cro4 soln -> yellow ppt of barium chromate -> ba2+ conf.

Pb2+

salt and NaOH -> No NH3 gas-> zero gp. absent

aq. soln and dil HCl -> white ppt -> 1 gp. present (Pb2+ poss.)

aq ext. add KI soln -> Yellow ppt of PbCH3COO -> Pb2+ confirm

aq. ext add K2CrO4 -> yellow ppt of lead chromate -> Pb2+ confirm

Al3+

Pinch of salt and NaOH -> No NH3 gas -> Zero gp. absent

Aq Salt,and dil HCl -> No ppt -> 1 gp. absent(Pb2+)

Pass H2S gas -> No ppt -> 2 Gp. absent

expel h2s gas,add conc. HNO3 and NH4Cl and NH4OH -> White gellatine ppt -> 3 gp. present(Al3+ possible)

Filter ppt and add dil HCl , blue litmus soln and NH4OH dropwise -> Blue litmus soln floats -> Al3+ confirm

NH4+

Pinch of salt in TT and add NaOH->Ammonical Smell -> Zero Group Present NH4+ Possible

Bring glass rod dipped in dil HCl over mouth -> White Fumes -> NH4+ possible

Filter paper dipped in Nesslers Reagent over mouth -> Brown filter paper -> NH4+ confirmed