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SS2: CHEMISTRY - 1ST TERM

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  1. Periodicity and Periodic Table I | Week 1
    5 Topics
    |
    1 Quiz
  2. Quantum Numbers Orbitals & Electrical Structure | Week 2
    6 Topics
    |
    1 Quiz
  3. Periodicity and Periodic Table II | Week 3
    12 Topics
    |
    1 Quiz
  4. Periodicity and Periodic Properties III | Week 4
    11 Topics
    |
    1 Quiz
  5. Periodicity and Periodic Properties IV | Week 5
    5 Topics
    |
    1 Quiz
  6. Mass-Volume Relationship in Reaction | Week 6
    8 Topics
    |
    1 Quiz
  7. Types of Reactions: Oxidation and Reduction | Week 7 & 8
    7 Topics
    |
    1 Quiz
  8. Oxidation – Reduction Reaction II | Week 9
    3 Topics
    |
    1 Quiz
  9. Electrode Potential and Electrochemical Cells I | Week 10
    6 Topics
    |
    1 Quiz
  10. Electrode Potential and Electrochemical Cells II | Week 11
    5 Topics
    |
    1 Quiz
  11. Electrolysis I | Week 12
    8 Topics
    |
    1 Quiz
  12. Electrolysis II | Week 13
    8 Topics
    |
    1 Quiz
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Lesson 11, Topic 3
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Strong and Weak Electrolytes

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Topic Content:

  • Strong Electrolytes (strong acids, strong bases, soluble ionic salts)
  • Weak Electrolytes (weak acids, weak bases)

Strong Electrolytes:

Strong electrolytes are compounds that disassociate or ionize completely in water or an aqueous solution.

e.g.

(a) strong acids: 

(i) HCl(aq) ⇌  H+(aq) + Cl(aq)

(ii) H2SO4[aq)   ⇌ 2H+(aq) + SO42-(aq)

(iii) HNO3(aq)  ⇌  H+(aq) + NO3(aq)

(b) Strong alkalis: 

(i) NaOH(aq) ⇌ Na+(aq) + OH(aq)

(ii) KOH(aq)  ⇌  K+(aq) + OH(aq)

(c) Soluble ionic salts 

(i) NaCl(aq)  ⇌ Na+(aq) + Cl(aq)

(ii) CuSO4(aq) ⇌ Cu2+(aq) + SO42-(aq) 

Weak Electrolytes:

Weak electrolytes are substances that slightly or partially disassociate in water or aqueous solution.

e.g.

(a) Weak acids: 

(i) CH3COOH(aq)  ⇌ CH3COO(aq) + H+(aq)

(ii) H2CO3(aq) ⇌ 2H+ + CO32-(aq)

(iii) H2SO3 ⇌ 2H+ + SO32-(aq)

(b) Weak bases:

(i) NH4OH(aq) ⇌ NH4+(aq) + OH(aq)

(ii) (Limewater) Ca(OH)2 ⇌ Ca2+(aq) + OH(aq)