Qualitative Analysis Flashcards
Brisk effervescence and turns lime water milky
Carbonate ion
Chromium Chloride Test is not given by
- Chlorides of Hg, Sn, Ag, Pb and Sb;
- Bromides
- Iodides
Brown Ring Test
Nitrate Ion
Barium Chloride Test
Sulphate Ion
Ammonium Molybdate test
Phosphate Ion
Mixture + conc. HNO3 + ammonium Molybdate
Canary yellow precipitate
Phosphate ion confirmed
Mixture + BaCl2 soln. + conc. HCl
BARIUM CHLORIDE TEST
White ppt. Insoluble in mineral acids
Sulphate ion confirmed
Mixture + K2Cr2O7 + conc. H2SO4
Pass over NaOH
Treat with lead acetate
CHROMYL CHLORIDE TEST
Orange-yellow vapours of chromyl chloride (CrO2Cl2)
Forms yellow ppt of lead chromate
Chloride ion confirmed
Interfering Acid Radicals
- Borate
- Oxalate
- Fluoride
- Phosphate
they interfere in usual test of basic radicals
Group 1 Reagent
Dil. HCl
Group 2 Reagent
Dil. H2SO4 and pass H2S
Group 3 Reagent
NH4OH in presence of NH4Cl and add dil. HNO3
Group 4 reagent
NH4OH with NH4Cl and pass through H2S
Group 5 reagent
NH4OH with NH4Cl and (NH4)2CO3
Group 6 reagent
Sodium Hydrogen Phosphate
Na2HPO4
Nessler’s Reagent Test
Ammonium Ion
Brown ppt
Borax Bead Test
Platinum wire heated + dipped in borax powder + heat
Formula of borax bead
Sodium metaborate
NaBO2
Transparent glassy bead
Borax Bead Test—blue
Cobalt
Borax Bead test—light blue/green and colourless/red
Copper
Borax Bead Test—-yellow brown/bottle green
Iron (Fe+3)
Borax Bead Test—green and green
Chromium
White ppt. + dil. HCl
+ H2O + KI
Observation?
Red ppt.
Lead
Brown ppt in Nessler’s Reagent Test is due to formation of?
Iodide of Millon’s Base
Sodium Carbonate Extract + Sodium Nitopruside
Observation?
Purple colour of
Na4[Fe(CN)5NOS]
Due to presence of Sulphide Ion(S-2)
Mercurous Chloride (HgCl) + NH4OH
Observation?
Black ppt of Hg
Insoluble in Dil. HNO3
HgS
Cr(OH)3 + NaOH + Na2O2
Observation?
Yellow colour of Na2CrO4
Metal Ion soln. + Cobalt(ll)thiocyanate
Deep blue soln.
Hg+2
Mercurous salt + Cobalt(ll)thiocyanate
Deep blue solution
A compound that does not impart colour to the flame
KI
Reaction of bismuth and antimony chlorides with water?
White ppt. Of oxychloride formed
BiOCl for bismuth
Type of compound that gives blood red colour with FeCl3
a compound containing N and S
This forms NaSCN
Which on reaction with FeCl3 gives FeSCN(blood red)
An ion that cannot be precipitated by both HCl and H2S
Sn+2
Fe+3 soln. + PO4 -3 soln.
Ppt of FePO4 formed
Silver salt insoluble in water
Ag2SO4
Active species in Nessler’s Reagent for Detecting NH4+ ion?
[HgI4]-2
