To detect the acid and basic radicals in given salt (In Magnesium Sulphate).

Experiment – 9

Class – XII

Subject – Chemistry

Aim:-

To detect the acid and basic radicals in given salt (In Magnesium Sulphate).

Apparatus:-

Test tube, test tube stand, test tube holder, burner, beaker, litmus paper, match box etc.

Physical Characteristic:-

1.     State: - solid crystalline

2.     Color:- Colorless

3.     Odour:- No specific odour

4.     Solubility:-  Soluble in cold water

Detection of Acid Radicals

Sr. No	Experiment		Observation	Inference
1.	Heating with dil. H2So4 ­Take the pinch of salt & dil. H2So4 was added.		No gas evolved	Co3-, So3-, S2- No2- CH3COO-  ions absent
2.	Heating with conc. H2So4 The salt was heated with conc. H2So4.		No gas evolved	Cl-, Br-, I-, No3- absent
	Test for So42-  Ion
a.	BaCl2 test To pinch aqua solution salt BaCl2 was added.		A white ppt was formed which was insoluble in dill. HCl	So42-  ion was confirmed
	So42-  + BaCl2    à    BaSo4 ↓ + 2 Cl -
b.	Lead acetate test To aqua solution of salt acetic acid & lead acetate was add.	A white ppt obtained			So42-  ion was confirmed
	So42- + Pb (COOCH3)2    à     Pb So4 ↓  + 2 CH3COO-

 

Detection of Basic Radicals:-

Sr. No.	Experiment		Observation		Inference
a.	O.S. was added with dil. HCl.		No PPT was observed		Group I radical absent
b.	O.S. was added with dil. HCl and H2S was passed.		No PPT obtained		Group II radical absent
c.	O.S. was added with NH4Cl heated & Cooled & then added with excess NH4OH.		No PPT was obtained		Group III radical absent
d.	O.S. was added with NH4Cl and NH4OH followed by H2S gas.		No PPT was observed		Group IV  absent
e.	To the O.S. a small quantity of solid NH4Cl as added then boiled & cooled & NH4OH was added then (NH4)2 Co3 solutions added.		No PPT obtained		Group V absent
	Confirmatory test:-
1.	Test for Mg2+ ion Ammonium phosphate test To O.S. some solid NH4Cl & NH4OH in slight excess was added then ammonium phosphate solution was added.	White ppt was obtained		Mg2+ Confirmed
	Mg2+ + HPo42- + NH4+       à     Mg (NH4)  Po4 + H +

 

Conclusion:-

On the basis of above test, we conclude that given salt contain.

Acid Radical:            So₄^2-

Basic Radical:           Mg²⁺

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