Lead Acetate

Lead Acetate

source :scbt

Method of Preparation :

By the reaction of litharge and acetic acid : Lead acetate solution is obtained which on concentration gives crystal of (CH₃COO)₂Pb.3H₂O

Properties of lead acetate:

1. It is colorless crystalline solid, soluble in water. Its aqueous solution is sweet but poisonous.

2. Effect of heat : we get  acetone .

3. Reaction with H₂S :  Black precipitate of  lead acetate  is obtained.

4. Reaction with HCl : As a result we get white precipitate  of lead chloride.

5. Reaction with Potassium chromate ( K₂CrO₄) : yellow precipitate  of Lead  chromate is formed.

6. Reaction with Sodium bicarbonate (NaHCO₃) : white precipitate  of lead carbonate is formed.

7. Reaction with litharge : Basic lead acetate is obtained.

Uses :

• As medicines in curing skin disease.
• In the preparation of basic lead acetate.

Method of preparation: by the reaction of lead acetate with litharge

Properties of basic lead acetate:

1. It is colorless crystalline solid soluble in water.

2. Reaction with CO₂: white precipitate is obtained.

Uses:

• In the preparation of white lead.
• In medicines.

Red lead (Pb₃O₄) Triplumbic tetra oxide, Sindoor 

Method of preparation :

By heating litharge with air : At 340 degree red lead is obtained.

6Pbo + O2 ———> 2Pb₃O₄

[Note: Red lead is a mixture of PbO₂ + 2PbO]

Properties :

i) It is  red  powder, insoluble in water.

ii) Effect of heat : It decomposes at 470 degree

2Pb₃O₄ ———–> 6PbO + O₂

iii) Reaction with dilute HNO3 : As a result of reaction we get  Lead nitrate and lead dioxide .

Pb₃O₄ + 2HNO₃ ———–> Pb(NO₃)₂ + 2PbO₂ + H₂O

iv) Reaction with concentrated HCl : We get lead chloride and chlorine .

Pb₃O₄ + 8HCl ———-> 3 PbCl₂ + Cl₂ + 4H₂O

Uses :

i) As a red pigment

ii) In the protection of iron from rusting.

Conversion Questions:

a) Tin to anhydrous stannous chloride :

b)  stannous chloride ( SnCl2) to Tin :

c) Litharge to red lead :

d) Red lead to litharge : 

e) Lead to lead nitrate :

f) Lead nitrate to white lead :

6 Pb(NO₃)₂ + 6Na₂CO₃  + 2H₂O ——–> 2[2PbCO₃ . Pb(OH)₂] +12NaNO₃+ 2CO₂