To analyse the given salt for acidic and basic radicals. (Example No. 3)

EXPERIMENT	OBSERVATIONS	INFERENCE
1.PHYSICAL EXAMINATION: a) Colour of the given salt. b) Noted the smell of the salt.	Blue No specific odour	Cu2+, Ni2+ maybe present NH4+, S2- and CH3COO- may be absent.
2. DRY HEAT TEST Heated a pinch of the salt in a dry test tube	No gas evolved	CO32-, S2-, SO32-, Cl-, NO2-, NO3- maybe absent.
3.DIL. SULPHURIC ACID TEST Treated a pinch of salt with dil. H2SO4 and warmed.	No gas evolved.	CO32-, S2-, SO32-, NO2-, may be absent.
4.CONC. SULPHURIC ACIS TEST Heated a pinch of the salt with conc. Sulphuric acid and added to it a paper pellet.	-	Cl-, Br-, I-, NO3- CH3COO- maybe absent
5. Test for sulphate ion:- Sodium carbonate extract + dil. HCl + BaCl2 solution Confirmatory Test:- Above ppt is dissolved in conc. HNO3	White ppt. is obtained ppt. is insoluble	SO42- present SO42- confirm
6.Heated a pinch of salt with conc. NaOH solution	No ammonia gas evolved.	NH4+ absent.
7.To a part of the o.s. added 1-2 ml of dil. HCl	No ppt. formed.	Group I absent. (Pb2+ absent)
8.Trough a part of the above the solution, passed H2S gas	Black ppt. formed.	Group II present (Pb2+, Cu2+, As3+ may be present)
9. Dissolve the ppt. in dil. HNO3 and divide the solution into two parts (a) 1st part + dil H2SO4 + C2H5OH (b) 2nd part + NH4OH in excess	White ppt. not obtained Blue solution is obtained	Pb2+ absent Cu2+ present
10. Confirmatory Test In above solution add CH3COOH + K4[Fe(CN)6]	Chocolate ppt is obtained	Cu2+ confirmed
11. Flame test	Green coloured flame	Cu2+ confirmed

RESULT:                    ACID RADICAL: SO₄^2-                   BASIC RADICAL: Cu²⁺