To detect the acid and basic radicals in given salt (In Lead Acetate).

 

To detect the acid and basic radicals in given salt 

(In Lead Acetate).

Experiment – 4

Class – XII

Subject – Chemistry

Aim:-

To detect the acid and basic radicals in given salt (In Lead Acetate).

Apparatus:-

Test tube, test tube stand, test tube holder, burner, beaker, litmus paper, match box etc.

Physical Characteristic:-

1.     State: - solid crystalline

2.     Color:- Colorless

3.     Odour:- Vinegar smell

4.     Solubility:- Soluble in both cold and hot water.

Detection of Acid Radicals

Sr. No	Experiment	Observation	Inference
1.	Heating with dilute H2So4 Take the pinch of salt 2 – 3 ml of dil. H2So4  was added.	No gas evolved	No2-, So3-, Co32- HCo3- or S2-  ions absent
2.	Heating with Conc. H2So4 Take the pich salt 2 – 3 ml of H2So4  added	A gas evolved with vinegar smell	CH3COO- may be present.
3.	Confirmatory Test		CH3COO- ion observed
(a)	Oxalic Acid Test A small quantity of slat taken on plam and was mixed with oxalic acid paste of it was prepared with few drops of H2O and rubbed of smell .	Smell like vinegar was observed
	(COOH)2  + 2 CH2 COOH      à     (COONa)2 + 2 CH3 COO (Acetic vinegar)
(b)	Ferric Chloride Test Take the original solution in water 2 – 3 ml of neutral ferric chloride was added and heated.	Deep red coloration which is changed to reddish brown ppt	CH3COO-  ion confirmed
	3CH3COONa + FeCl3      à     (CH3COO)3 Fe + NaCl (CH3COO)3 Fe + 2 H2O    à     (CH3COO) (OH)3 Fe ↓ + 2 CH3 COO                                                                     ( Reddish brown ppt)
(c.)	Ester Test Take small quantity of salt in test tube add conc. H2So4 and heat. Now add ethylolchol. Shake and pour the content of tube in beaker full of water stir.	Pleasant fruity smell	CH3COO-  ion confirmed
	2CH3COONa + H2So4        à     Na2 So4 + 2 CH3 COOH CH3 COOH + C2 H5 OH      à     CH3 COOC2 H5 + H2O                                                               Ethyl Acetate (Fruity Smell)

 

Detection of Basic Radicals:-

Sr. No.	Experiment	Observation	Inference
1.	Take the original solution and add few drop of dil. HCl . The ppt was heated with water.	White ppt was observed ppt dissolved	Pb2+  may be present
	Pb2+ + 2 HCL      à      PbCl2 + 2 H+           ( White ppt )
	Confirmatory Test :- The solution was divided into two parts
(a)	Potassium Iodide test In first part KI to be added	Deep yellow ppt was formed	Pb2+  may be confirmed
	PbCl2 + 2 KI      à     PbI2 + KCl       (Yellow ppt of lead Acetate)
(b)	Potassium chromate Test Potassium chromate solution added in second part	Yellow ppt was observed	Pb2+  confirmed
	PbCl2 + K2 Cro4        à      Pb Cro4 + 2 KCl            (Yellow ppt of lead chromate)

 

Conclusion:-

On the basis of above test, we conclude that given salt contain.

Acid Radical :           CH₃COO^-

Basic Radical:           Pb²⁺

 

S. No.	Name of Experiment	Link
1.	To prepare 250 ml of M/20 of oxalic acid solution.	Click Here
2.	To determine the molarity and Strength of KMnO4 solution by treating with standard solution oxalic acid	Click Here
3.	To determine the molarity and strength of KMnO4 solution by treating with standard solution of Mohr’s Salt.	Click Here
4.	To detect acid and Basic radical to given salt (in Lead Acetate).	Click Here
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