Find out two acid and two basic radixals in tha given salt mixture
Answers
Answer:
Explanation:
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. DRY HEAT TEST
Heated a pinch of the salt in a
dry test tube
A reddish brown gas evolved which turned FeSO4 solution black.
NO3- may be present.
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.
A reddish brown gas evolved which turned FeSO4 solution black.
NO3- may be present.
5.CONFIRMATORY TEST FOR NITRATE
a) Copper chips test.
Heated a pinch of the salt with conc. Sulphuric acid and a few copper chips.
b) Ring test. To 2-3 mL of the salt solution, added freshly prepared FeSO4 solution. Then added conc. Sulphuric acid along the sides of the test tube.
Reddish brown gas evolved.
A dark brown ring formed at the junctions of the two liquids.
NO3- confirmed.
NO3- confirmed.
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 SOLUTION, PASSED H2S GAS
No ppt. formed.
Group II absent
(Pb2+, Cu2+, As3+ absent)
9. 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.
10.THROUGH A PART OF THE ABOVE SOLUTION, PASSED H2S GAS
No ppt. formed.
Group IV absent.
(Zn2+, Mn2+, Co2+ and Ni2+ absent)
11. TO THE REMAINING AMMONICAL SOLUTION ADDED (NH4)2CO3 SOLUTION.
White ppt. formed.
Group V present.
(Ca2+, Ba2+, Sr2+ may be present)
12. CONFORMATORY TEST
Filtered the above white ppt. dissolved the ppt. in hot dilute acetic acid
a) Pot. Chromate test. To one part of the above solution, added a few drops of pot. Chromate solution.
b) Flame test. Performed flame test with the salt.
Yellow ppt. formed.
Persistent grassy green flame on prolonged heating.
hope this will help...
Ba2+ confirmed.
Ba2+ confirmed.
RESULT: ACID RADICAL: NO3- BASIC RADICAL: Ba2+