SALT ANALYSIS -VII(BARIUM CHLORIDE)
Preliminary tests
S.
Experiment Observation Inference
No
Physical examination
White
a) Noted the colour of the salt Cu2+, Fe2+, Fe3+ absent
1
NH4+, S2-, CH3COO-
b) Noted the smell of the salt No specific odour Absent.
Dry Heating test Heated a
pinch of the salt in a dry test tube and
noted the following observations:
a) Gas evolved Greenish yellow gas evolved
which turn starch iodide Cl- may be present.
paper blue
2
b) Sublimation Ammonium chloride,
No sublimate formed.
iodide may be absent.
c) Decrepitation Lead nitrate, Barium
No cracking sound observed.
nitrate absent.
d)Colour of the residue White residue, glows on Ba2+, Mg2+ may be
heating present.
Flame test Prepared a paste of
Persistent grassy green flame
3 the salt with Conc.HCl and performed
On prolonged heating. Ba2+ present.
flame test.
Identification of acid radical
S.
Experiment Observation Inference
No
Colourless, odourless gas
Dil HCl test Treated a pinch of the salt
6 evolved with brisk CO32- absent.
With dil HCl and warmed.
effervescence not observed
KMnO4 test To a pinch of the salt
Cl-, C2O42-, Fe+2 may be
7 added dil.H2SO4 warm and then a drop KMnO4 decolourised
present..
of KMnO4 solution.
Copper chips test Heated a pinch of the
8. salt with conc. sulphuric acid and a few No reddish brown gas evolved. NO3- may be absent.
copper chips.
(a) Chromyl chloride Test Red vapours evolved into the
Mix a small quantity of the salt with a gas detector containing
small amount of powdered potassium NaOH solution. To the
9. Cl- confirmed.
dichromate. Take the mixture in a test yellow solution thus
tube and add conc.H2SO4. Heat the test obtained, add dil. acetic acid
tube and lead acetate solution
Confirmatory test for acid radical
b) Silver nitrate test
Acidify a portion of extract with dil. No precipitate Cl- absent
HNO3. Boil for some time, cool and
add silver nitrate solution
Identification of basic radical
NaOH test Heated a pinch of salt with
10 No ammonia gas evolved NH4+ absent
conc.NaOH solution
Preparation of original salt solution
Prepared original salt solution by dissolving a pinch of salt in 10 to15mL of distilled water or dil.HCl or
conc.HCl, cold or hot. Label it original solution (O.S).
S.
Experiment Observation Inference
No
Group separation a) To a few drops of
the original solution added 1mL of Group zero absent
11 No Brown precipitate formed
Nessler’s reagent and excess of NaOH ( NH4+ absent)
solution
b) To a few drops of the original solution Group I absent
12 No precipitate formed
added 2mL of dil.HCl. (Pb2+absent)
c) To a few drops of the original solution
Group II absent
13 added 2mL of dilHCl and then passed H2S No precipitate formed
(Cu2+absent)
gas
d) To a few drops of the original solution Group III absent.
14 No precipitate formed
added 1mL of NH4Cl and 2ml of NH4OH. (Al3+absent)
e) To a few drops of the original solution Group IV absent
15 added 1mL of NH4Cl and 2mL of NH4OH No precipitate formed (Zn2+absent)
and then passedH2S gas.
16
f) To a few drops of the original solution
Group V present
added 1mL of NH4Cl,2mL of NH4OH and White precipitate formed
(Ba2+, Sr2+, Ca2+ present)
2mL of saturated solution of (NH4)2CO3
Confirmatory test for basic radical
a) Potassium chromate test
To a few drops of the original solution
Yellow precipitate obtained Ba2+confirmed
added 2 to 3 drops of potassium
chromate solution.
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Result:
The given simple salt is : Barium chloride (BaCl2)
Acid radical: Cl-
Basic radical: Ba2+
