To analyse the given salt for acidic and basic radicals. (Example No. 4)

EXPERIMENT	OBSERVATIONS	INFERENCE
1.PHYSICAL EXAM:- a) Observe the colour of the         salt. b) Observe the smell of the salt.	White Ammoniac smell	Cu2+, Mn2+, Co2+, Ni2+, Fe3+ absent. NH4+, may be absent.
2. DILUTE H2SO4TEST:- a) Treated a pinch of the salt with dilute H2SO4. b) Shook a pinch of salt with water taken in a test tube.	Coulourless, odourless, gas evolved with brisk effervescence, turned lime water milky. Salt did not dissolve.	CO32- present Insoluble indicated.
3. CONFIRMATORY TEST FOR CARBONATE:-  Tried to dissolve the salt in water. To the salt added dilute HCl.	The salt is insoluble in water. Brisk effervescence with evolution of colourless, odourless gas which turned lime water milky.	Insoluble carbonate indicated. Insoluble  carbonate confirmed.
4. Heated a pinch of salt with concentrated NaOH solution.	Ammonia gas evolved.	NH4+ may be present.
5. Confirmatory Test:- a. Bring a glass rod dipped in conc. HCl near the mouth of the test tube b. Bring a filter paper dipped in Nesseler’s reagent near the mouth of the test tube	White dense fumes Filter paper turned reddish brown	NH4+ presence is confirmed NH4+ presence is confirmed

Result :-                                               Anion:- CO₃^2-                     Cation:- NH₄⁺