(B)WET TESTS FOR BASIC
RADICALS
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Group
|
Group reagent
|
Cation
|
Precipitated( color)
|
|
|
I
|
Dil
HCL
|
Ag22+,Pb2+,Hg22+
|
Chloride(@white)
|
|
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IIA
|
Dil HCL+H2S
|
Hg2+,Pb2+,Bi3+,Cu2+,Cd2+
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Sulphide(@black)
|
black
|
|
IIB
|
Dil HCL+H2S
|
As3+,Sb3+,Sn2+/Sn4+
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Sulphide(yellow,
|
yellow
|
|
Sb2S3@orange)
|
orange |
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IIIA
|
NH4Cl+NH4OH
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Al3+,Cr3+,Fe3+
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Hydroxides
|
|
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Al(OH)3@white,
|
|
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Cr(OH)3@green,
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green
|
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Fe(OH)3@brown
|
brown
|
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IIIB
|
NH4Cl+NH4OH+H2S
|
Co2+,Ni2+,Mn2+,Zn2+
|
Sulphide
|
|
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CoS
|
Black
|
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NiS
|
Black
|
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MnS
|
Flesh
|
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ZnS(white)
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IV
|
NH4Cl+NH4OH+(NH4)2CO3
|
Ba2+,Sr2+,Ca2+
|
Carbonate(@white)
|
|
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V
|
No particular group reagent
|
Na+,K+,NH4+,Mg2+
|
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