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Iodide

The document outlines the identification of the acid radical in a salt sample, concluding that it is Iodide (I−). Various tests, including dry tests with dilute sulfuric acid and oxalic acid, as well as a confirmatory test using silver nitrate, were conducted to confirm the presence of I−. The results indicated no other acid radicals were present, and a yellow precipitate formed during the silver nitrate test confirmed the presence of Iodide.

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Deepram Abhi
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59 views1 page

Iodide

The document outlines the identification of the acid radical in a salt sample, concluding that it is Iodide (I−). Various tests, including dry tests with dilute sulfuric acid and oxalic acid, as well as a confirmatory test using silver nitrate, were conducted to confirm the presence of I−. The results indicated no other acid radicals were present, and a yellow precipitate formed during the silver nitrate test confirmed the presence of Iodide.

Uploaded by

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

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 Deep violet vapours The evolving gas
test tube with equal amount of MnO2, 2-3 evolve which turn is I2 and the
drops conc. H2SO4 was added and heated. starch solution blue presence of I− ion
is indicated.
CHEMICAL REACTIONS INVOLVED:-
-
MnO2 + 3H2SO4 + 2I−→ MnSO4+ I2 ↑ + 2HSO4 + 2H2 O
Deep violet vapour

(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 Iodide ion:
S.No Experiment Observation Inference

i Silver Nitrate test – A yellow ppt.is The presence of I−


To the O.S, AgNO3 solution is formed which is
ion is confirmed.
added. insoluble in NH4OH
solution.
CHEMICAL REACTIONS INVOLVED:-
AgNO (aq) + I− (aq) → AgI ↓ + NO −
3 3

yellow ppt.

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


sample is Iodide, I−

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