DATE EXPERIMENT NO.________
( SALT ANALYSIS)
AIM : To detect the acidic & basic radical present in the given salt no.____
S.No.
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EXPERIMENT
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OBSERVATION
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INFERENCE
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1.
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Physical tests:
(i) Colour
(ii) Odour
(iii) Solubility
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White
Smell of Ammonia gas
Soluble
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NH4+ , Pb2+ , As3+ , Al3+ , Zn2+ , Ca 2+ , Sr2+ , Ba2+ , Mg2+ may be present.
NH4+ may be present.
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2.
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Tests for basic radicals
( cations)
GROUP Zero Test
SODIUM HYDROXIDE TEST :---
Take a pinch of the salt & add NaOH solution . Heat it gently.
Bring a glass rod dipped in dil.HCl near the mouth of the test tube.
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Characteristic smell of Ammonia.
Dense white fumes are evolved.
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NH4+ is present.
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NESSLER’S REAGENT TEST :----
Take a pinch of the salt & add NaOH solution . Heat it gently.
Pass the gas evolved through Nessler’s reagent taken in another test tube.
Test for anions :
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Reddish Brown ppt.is formed.
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NH4+ is present.
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3.
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Take 1g of salt in a dry test tube and 4-5 ml of dil.H2SO4 .
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Colourless , odourless gas with brisk effervescence is evolved.
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May be Carbonate (CO32-).
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Pass the gas evolved through the lime water.
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Lime water turns milky.
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CO32- is confirmed.
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Pass CO2 for a longer time.
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Milkiness disappeares.
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CO32- is confirmed.
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Take aqueous solution of the given salt , then add MgSO4 solution.
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White precipitate is formed.
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CO32- is confirmed.
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RESULT : The given salt contains NH4+ basic radical & CO32- acidic radical.
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