To analyse the given salt for acidic and basic radicals. (Example No. 5)

EXPERIMENT	OBSERVATIONS	INFERENCE
1.PHYSICAL EXAMINATION: a) Colour of the given salt. b) Noted the smell of the salt.	White No specific odour	Cu2+, Mn2+, Co2+, Ni2+, Fe3+, absent. NH4+, S2- and CH3COO- may be absent.
2.DIL. SULPHURIC ACID TEST Treated a pinch of salt with dil. H2SO4 and warmed.	No gas evolved.	CO32-, S2-, SO32-, NO2-, may be absent.
3.CONC. SULPHURIC ACIS TEST Heated a pinch of the salt with conc. Sulphuric acid and added to it a paper pellet.	colourless gas with pungent smell	Cl- may be present.
4.CONFIRMATORY TEST a) Silver nitrate test. Sodium carbonate extract + dil. HNO3 + AgNO3 solution b) Chromyl chloride test:- (i)Mixture + conc. H2SO4 + solid K2Cr2O7 + heat (ii)The gas which is evolved is passed in NaOH solution (iii)To above solution add AcH + PbAc2	White ppt. is formed which is soluble in excess of NH4OH Dark reddish brown gas is evolved Solution of NaOH is change to yellow colour Yellow ppt is obtained	Cl- confirmed. Cl- confirmed.
5.HEATED A PINCH OF SALT WITH CONC. NaOH SOLUTION	No ammonia gas evolved.	NH4+ absent.
6.TO A PART OF THE O.S. ADDED 1-2 mL OF Dil. HCl	No ppt. formed.	Group I absent. (Pb2+ absent)
7.TROUGH A PART OF THE ABOVE SOLUTION, PASSED H2S GAS	No ppt. formed.	Group II absent (Pb2+, Cu2+, As3+ absent)
8. TO THE REMAINING SOLUTION, ADDED A PINCH OF NH4Cl. BOILED THE SOLUTION, COOLED IT AND ADDED EXCESS OF NH4OH SOLUTION.	No ppt. formed.	Fe3+, Al3+, absent.
9.THROUGH A PART OF THE ABOVE SOLUTION, PASSED H2S GAS	No ppt. formed.	Group IV absent. (Zn2+, Mn2+, Co2+ and Ni2+absent)
10. TO THE REMAINING AMMONICAL SOLUTION ADDED (NH4)2CO3 SOLUTION.	White ppt. formed.	Group V present. (Ca2+, Ba2+, Sr2+ may be present)
11. CONFORMATORY TEST Filtered the above white ppt. dissolved the ppt. in hot dilute acetic acid and divide into three parts a) 1st part + K2Cr2O7 b) 2nd part + (NH4)2SO4 c) 3rd par + (NH4)2C2O4 Flame test Dipped the Pt wire in dil. HCl + touch the ppt and ignite it	Yellow ppt. is not formed. White ppt. is not formed White ppt is formed Red flame like brick is produced	Ba2+ absent. Sr2+ absent. Ca2+ present Ca2+ is confirmed.

RESULT:                    ACID RADICAL: Cl^-                   BASIC RADICAL: Ca²⁺