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Mangnese Chloride

The document describes experiments performed to identify an unknown salt. The salt was found to be colorless and odorless, with no gas produced when reacted with dilute sulfuric acid. When reacted with concentrated sulfuric acid, the salt produced white, pungent-smelling fumes that intensified when exposed to ammonium hydroxide, indicating the presence of chlorine. Confirmatory tests with silver nitrate and chromyl chloride produced precipitates, further confirming the presence of chlorine. Additional tests revealed the presence of manganese ions. The salt was therefore identified as manganese chloride.

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385 views3 pages

Mangnese Chloride

The document describes experiments performed to identify an unknown salt. The salt was found to be colorless and odorless, with no gas produced when reacted with dilute sulfuric acid. When reacted with concentrated sulfuric acid, the salt produced white, pungent-smelling fumes that intensified when exposed to ammonium hydroxide, indicating the presence of chlorine. Confirmatory tests with silver nitrate and chromyl chloride produced precipitates, further confirming the presence of chlorine. Additional tests revealed the presence of manganese ions. The salt was therefore identified as manganese chloride.

Uploaded by

nishchay
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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AIM: To identify the given salt for acidic and basic radical .

Experiment Observations Inference


Colour: White salt Cu2+, Fe2+, Fe3+, Ni2+,
Noted the colour of Mn2+, Co2+ absent.
salt.
Smell: Odourless NH4+, CH3COO− and
Noted the smell. S2- absent.
Dil. H2SO4 Test: No gas evolved CO32- , SO32- , S2- ,
To a pinch of salt, add NO2– absent.
few drops of dilute
H2SO4

Conc. H2SO4 Test: White, pungent-smelling Cl –


To a pinch of salt, add fumes that intensify when may be present
few drops of Conc. a glass rod dipped in
H2SO4 and heat. ammonium hydroxide is
brought to the mouth of
the test tube
Confirmatory Tests:
(i)AgNO3 Solution white precipitate which is
Test: soluble in ammonium
Add silver nitrate hydroxide (NH4OH) Cl– Confirmed
solution to the water
extract

(ii)Chromyl chloride Cl– Confirmed


solution test:
Mix a Pinch of Salt
with an equal amount
of solid potassium red fumes of chromyl
dichromate in a test chloride (CrO2Cl2) evolved
tube along with
concentrated sulphuric
acid and heat for some
time .
Pass the gas through a
sodium hydroxide
solution a yellow solution is
obtained (Na2CrO4)
add a few drops acetic
acid and lead acetate yellow ppt. of lead
solution . chromate (PbCrO3)
formed.
Basic Radical
Test for group I No ppt. formed Pb2+ absent.
To the original
solution, add few
drops dil HCl

Test for group II No ppt. formed Cu2+ and As3+ absent.


To the original
solution, Add a few
drops of dilute HCl
and pass H2S gas .

No ppt. formed. Al3+ , Fe3+ absent


Test for group III
To the original
solution, Add a pinch
of solid ammonium
chloride (NH4Cl )
and excess of
ammonium
hydroxide (NH4OH)

Test for group IV Buff coloured ppt. (MnS) Mn2+


Add solid NH4Cl and May be present
excess NH4OH to the
original solution. Now
pass H2S gas through
it.
Confirmatory tests :

Dissolve ppt. in dil.


HCl. Heat to get clear
solution.
(i)Sodium Hydroxide Mn2+ confirmed.
Solution Test: White ppt.
Add NaOH to solution
obtained.
Add Bromine water to
ppt. Turn brown/black

(ii) Borax bead test: pinkish bead in oxidising Mn2+ confirmed.


Perform borax bead flame
test

Result:
The given salt is Manganese Chloride (MnCl2)

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