Cation analysis
4
Grou ps Group T est Preliminary T est Catio ns Confrmatory test Borax Bead and Flame Test 0 NaOH Heat Nh3 Gas Glass Rod Dil.HCl White Fumes NH 4 Nessler!s Rea"ent # $n %l&aline 'edium( Ori"inal )ol n Brown ppt. * Dil.HCl Con+.HCl Or H,O Normal To Dissolve Salt Dil.HCl White ppt. P- , Ppt. H,O Boil $ ,CrO4 Y ellow ppt. , Dil.HCl Con+.HCl Or H,O Normal To Dissolve Salt Dil.H Cl H,) /rom ipp!s %ppart us Coloured ppt. Black ppt. HN O Heat H,)O4 C,H1OH White ppt. P- , Ppt. NH4CHCOO Boil $ ,CrO4 Y ellow ppt. HNO Hea t 2x+ess NH4OH Blue Sol n Cu , Ppt. CHCOOH 43Fe#CN(5 Brown ppt. Y ellow pt. %s Ppt. HNO #NH4(,'oO4 Y ellow ppt. Dil.HCl Con+.HCl Or H,O Normal To Dissolve Con+.HN O Hea t NH4Cl Hea t !eddish Brown ppt. Fe Ppt. Dil.HCl 43Fe#CN(5 russian Blue CN) Blood !ed
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CAtions Analysis
Transcript of Cation analysis
Groups
GroupsGroup Test Preliminary TestCationsConfirmatory testBorax Bead and Flame Test
0NaOHHeat
Nh3 GasGlass RodDil.HCl
White FumesNH4+Nesslers Reagent( In Alkaline Medium)Original Soln
Brown ppt.
1
Dil.HClConc.HClOrH2OHeatOrNormal
To Dissolve Salt
Dil.HCl
White ppt.
Pb2+
Ppt.
H2O
Boil
KI K2CrO4
Yellow ppt.
2
Dil.HClConc.HClOrH2OHeatOrNormal
To Dissolve SaltDil.HCl
H2Sfrom Kipps Appartus
Coloured ppt.Black ppt.
HNO3Heat
H2SO4
C2H5OH
White ppt.Pb2+Ppt.
NH4CH3COO
Boil
KI K2CrO4
Yellow ppt.
HNO3Heat
Excess NH4OH
Blue SolnCu2+Ppt.
CH3COOH
K4{Fe(CN)6}
Brown ppt.
YellowPpt.As3+
Ppt.HNO3(NH4)2MoO4
Yellow ppt.
3
Dil.HClConc.HClOrH2OHeatOrNormal
To Dissolve SaltConc.HNO3Heat
NH4ClHeat
Washed in H2O
Excess NaOH
Ppt.Reddish Brown ppt.Fe3+
Ppt.Dil.HCl
K4{Fe(CN)6} Prussian Blue KCNSBlood Red
4H2S
Ppt.Dull White ppt.Zn 2+
Ppt.Dil.HCl
H2S Boiled off
NaOH White ppt. Dissolves in Excess NaOH K4{Fe(CN)6}Blueish White
Black ppt.And Greenish SaltPpt.Aqua Regia
Yellow Residue on EvaporationNi 3+
Original SolnNH4OH
Dimethyl Glioxime
Bright Rose ppt.BBTGrey in R.F.Brown in O.F.
Buff ColouredMn 2+Ppt.Dil.HCl
H2S Boiled off
Adding NaOH White ppt.Adding Bromine Water Turns Deep BrownBBTColourless in R.F.Pink-violet in O.F.
Black ppt. and Salt isDeep Pink or PurplePpt.Aqua Regia
Blue Residue on EvaporationCo2+Original SolnEther
Ammonium Thiocyanate
Blue Colour in Ethereal layerBBTDeep Bluein R.F. & O.F.
5
Dil.HClConc.HClOrH2OHeatOrNormal
To Dissolve SaltOriginal SolnNH4Cl
Boiled
Cooled
Nh4OH til smell of NH3 escapes
(NH4)2CO3
White ppt.Sr 2+
ppt.Hot Dil.Ch3COOH
K2CrO4If no ppt.(NH4)2SO4White ppt.
FTPaste of salt with Conc.HClinto flame using Pt wireCrimson Red
Ba 2+
ppt.Hot Dil.CH3COOH
K2CrO4
Yellow ppt.
FTPaste of salt with Conc.HClinto flame using Pt wireGrassy Green
Ca 2+ppt.HotDil.CH3COOH
K2CrO4If no ppt.(NH4)2SO4If no ppt.
NH4C2O4White ppt.
FTPaste of salt with Conc.HClinto flame using Pt wireBrick Red
6Dil.HClConc.HClOrH2OHeatOrNormal
To Dissolve SaltMg 2+Original SolnNH4Cl
Boiled
Cooled
Nh4OH til smell of NH3 escapes
NaHPO4
White ppt.
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