To detect the acid and basic radicals in given salt (In Barium Nitrate).

 

To detect the acid and basic radicals in given salt 

(In Barium Nitrate).

Experiment – 8

Class – XII

Subject – Chemistry

Aim:-

To detect the acid and basic radicals in given salt (In Barium Nitrate).

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-, So32-, S2- No2-  ions absent
2.	Copper chips test Small quantity of O.S. was added and heated with conc. H2So4 and copper turning.	No gas evolved	Cl-, Br-, I-, No3-, CH3COO-  absent
	2KNo3 + H2So4    à      K2So4 + 2 HNo3 4HNo3 + Co    à      Cu [No3]2  + 2 No2  + 2 H2O   ( Reddish brown)
	Confirmatory Test
a.	Ring Test A small quantity of freshly prepared solution of ferrous sulphate was added to a  part of the qua solution and then conc. H2So4 was poured slowly along the sides of the test tube.	A dark brown ring was formed at the function of the larger of the acid and solution.	No3- was confirmed
	KNo3 + H2So4     à       KHSo4 + HNo3 6 FeSo4 + 2 H2So4     à    2 HNo3   à   3 Fe2 (So4)3 + H2O + 2No FeSo4 + No + SH2O   à   [Fe (No) (H2O)5 So4]   brown ring

 

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 V radical 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.		White PPT observed		Ba2+, Sr2+, Ca2+ were present
	Confirmatory test:-
1.	Potassium Chromate test The ppt was dissolved in hot dil. Acetic acid & K2Cr O4 added.	Yellow ppt was observed.		Ba2+ Confirmed
	BaCo3 + 2 CH3 COOH    à     Ba (COOCH3)2 + H2O + Co2 Ba [ COOCH3]2 + K2 Cr O4  à  Ba Cr O4 + 2 CH3 COOK ( Yellow ppt)
	Flame Test A paste of salt was prepared with conc. HCl & flame test was performed.	Apple green flame was observed		Ba2+ Confirmed

 

Conclusion:-

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

Acid Radical:            No₃^-

Basic Radical:           Ba²⁺

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