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SS3: CHEMISTRY - 2ND TERM

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  1. Quality of petrol (Octane Number)| Week 1
    1 Topic
    |
    1 Quiz
  2. Natural Gas | Week 2
    3 Topics
    |
    1 Quiz
  3. Introduction to Metals | Week 3
    3 Topics
    |
    1 Quiz
  4. The Alkali Metals | Week 4
    4 Topics
    |
    1 Quiz
  5. Alkaline Earth Metals | Week 5
    3 Topics
  6. Aluminium & Tin | Week 6
    2 Topics
  7. Transition Metals of the First Series | Week 7
    4 Topics
  8. Ethical, Legal & Social Issues | Week 8
    3 Topics
  9. Fats & Oils - Soaps & Detergents | Week 9
    4 Topics
  10. Giant Molecules | Week 10
    6 Topics



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sodium hydroxide
Sodium Hydroxide

Manufacture of Sodium Hydroxide

Sodium hydroxide is prepared industrially by electrolysis of brine. During this electrolytic process, chlorine gas is liberated at the anode and hydrogen gas at the cathode. Sodium hydroxide solution is formed near the cathode.

Properties of NaOH

1. Sodium hydroxide is a white crystalline deliquescent solid.

2. It has the melting point of 318°C

3. It is stable towards heat

4. It is highly soluble in water and it dissolve exothermically.

5. It is also soluble in alcohol

6. Aqueous solution of sodium hydroxide is a strong alkaline because it dissociates completely in solution into Na+ and OH

7. Sodium hydroxide is slippery to touch and has a bitter taste. It is corrosive when concentrated.

Uses of NaOH

1. In the manufacture of soap, paper, organic dyestuffs, and many other chemicals

2. In the refining of petroleum and vegetable oils

3. In the purification of bauxite for the extraction of aluminium

4. As a cleansing agent and in washing powder for machines, metal sheets etc. 

5. As a reagent in the laboratory

6. In the preparation of soda lime

7. For absorbing CO2(g)

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