qualitative analysis 🌗 Flashcards
Ca2+ observation in NaOH and NH3
NaOH: white ppt, insoluble in excess
NH3: no ppt
NH4+ observation in NaOH and NH3
NaOH: no ppt. on heating, ammonia gas is evolved
NH3: NIL
Zn2+ observation in NaOH and NH3
NaOH: white ppt, soluble in excess
NH3: white ppt, soluble in excess
Al3+ and Pb2+ observation in NaOH and NH3
NaOH: white ppt, soluble in excess
NH3: white ppt, insoluble in excess
Cu2+ observation in NaOH and NH3
NaOH: light blue ppt, insoluble in excess
NH3: light blue ppt, soluble in excess to form a deep blue solution
Fe2+ observation in NaOH and NH3
green ppt, insoluble in excess
Fe3+ observation in NaOH and NH3
reddish-brown ppt, insoluble in excess
test for SO4 2- ions
add dilute nitric acid followed by aqueous barium nitrate. white ppt formed
test for Cl- ions
add dilute nitric acid followed by aqueous silver nitrate. white ppt formed
test for I- ions
add dilute nitric acid followed by aqueous silver nitrate. yellow ppt formed
test for CO3 2-
add dilute acids, carbon dioxide evolved
test for NO3- ions
add dilute NaOH and aluminium foil and warm, ammonia gas produced
test for hydrogen gas
gas produced extinguishes a lighted splint with a ‘pop’ sound
test for carbon dioxide gas
gas produced forms white ppt in limewater
test for ammonia gas
gas produced turns moist red litmus paper blue