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Bromide

The document outlines the identification of the acid radical in a salt sample, concluding that Bromide (Br−) is present. Physical characteristics indicate the sample is a white, crystalline, and water-soluble substance. Various dry and wet tests, including reactions with dilute sulfuric acid and silver nitrate, confirm the presence of Br− ions.

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Deepram Abhi
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24 views1 page

Bromide

The document outlines the identification of the acid radical in a salt sample, concluding that Bromide (Br−) is present. Physical characteristics indicate the sample is a white, crystalline, and water-soluble substance. Various dry and wet tests, including reactions with dilute sulfuric acid and silver nitrate, confirm the presence of Br− ions.

Uploaded by

Deepram Abhi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Bromide, Br−

AIM: To identify the acid radical present in the given salt sample.

(A) PHYSICAL CHARACTERISTICS:


Colour-White, Odour: odourless
State: crystalline, Solubility: soluble in water
(B) DRY TESTS FOR ACID RADICALS:-
S.No Experiment Observation Inference
i Dilute sulphuric acid test – To a pinch of salt No brisk effervescence CO3 2− absent
taken in a dry test tube, 1-2 ml of dil. H2SO4 was No gas with smell of SO3 2− absent
added. burning sulphur
No gas with rotten egg S 2− absent
smell
No reddish-brown gas NO2− absent
ii Oxalic acid test- To a pinch of the salt taken on No smell of vinegar CH3COO− absent
a watch glass, oxalic acid crystals and few drops
of water were added to make a paste.
iii MnO2 test- To a pinch of the salt taken in a dry Reddish brown The evolving gas
test tube with equal amount of MnO2, 1-2ml vapours evolve which is Br2 and the
conc. H2SO4 was added and heated. turn starch solution presence of Br −
yellow. ion is indicated.
CHEMICAL REACTIONS INVOLVED:-
MnO2 + 3H2SO4 + 2 Br − → MnSO4 + Br2 ↑ + 2HSO4− + 2H2O
Reddish brown vapours

(C) WET TEST FOR CONFIRMATION OF ACID RADICAL:-

(i) Preparation of original solution- A little amount of salt was taken in a clean dry test tube to which 5
ml distilled water was added. The test tube was shaken till the salt dissolved and a clear solution was
obtained. This solution is labeled as original solution (o.s)
(ii) Confirmatory test of Bromide ion:
S.No Experiment Observation Inference

i Silver Nitrate test – A pale-yellow ppt. is The presence of Br−


To the OS, AgNO3 solution is added. formed which is sparingly ion is confirmed.
soluble in NH4OH
solution.

CHEMICAL REACTIONS INVOLVED:-


AgNO3 (aq) + Br − (aq) → AgBr ↓ + NO3−
Pale yellow ppt.

(D) RESULT:- The acid radical present in the given sample is


Bromide, Br −

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