Individual anions ( Sulphate and Phosphate)

DATE

                                                 EXPERIMENT NO._________

Aim  : To test the presence of Sulphate ( SO42-)  in the given salt.

S.No.	EXPERIMENT	OBSERVATION	INFERENCE
1.	Physical tests: (i) Colour  (ii) Odour (iii) Solubility
2.	BARIUM CHLORIDE TEST :- To the aqueous solution of the given salt, add a few drops of dil.HCl and add then BaCl2 solution.	White ppt. insoluble in conc.HCl is obtained.	SO42- is confirmed.
3.	LEAD ACETATE TEST :------Take salt solution in a test tube & add  Lead Acetate solution to it.	White ppt. soluble in excess of ammonium Acetate solution.	SO42-  is confirmed.

RESULT  : The given salt contains   Sulphite (SO42- )  in it .

REACTIONS INVOLVED  :---------

(i)   SO42- (aq) +  BaCl2   (aq)               ----------------🡪   BaSO4 (s)  + 2 Cl – ( aq)

                                                                                            White ppt.

 (ii)  SO4 2- (aq) +  Pb ( CH3COO)2 (aq)   -------------🡪  PbSO4 (s) + 2CH 3COO - (aq)

                                                                                            White ppt.

                                                                                                         

DATE

                                                 EXPERIMENT NO._________

Aim :  To test the presence of Phosphate (PO43- ) in the given salt.

EXPERIMENT	OBSERVATION	INFERENCE
Physical tests: (i) Colour  (ii) Odour (iii) Solubility
AMMONIUM MOLYBDATE TEST :------ T o the aqueous solution of the given salt , add conc. HNO3  & excess of Ammonium molybdate solution and heat.	Canary yellow ppt. or colouration is obtained.	PO43- is confirmed.

RESULT  : The given salt contains Phosphate (PO43- )  in it .

REACTIONS INVOLVED  :--------

 PO43- (aq)   + 12 MoO42- + 24 H+----------------🡪   (NH4)3PO4.12MoO3  +  12 H2O(l)  

                                                                                            Ammonium 

                                                                                     Phosphomolybdate

                                                                                         ( canary yellow )