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SS1: CHEMISTRY - 2ND TERM

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  1. Kinetic Theory of Matter | Week 1
    3 Topics
    |
    2 Quizzes
  2. Kinetic Theory of Matter & Gas Laws 1 | Week 2
    3 Topics
    |
    2 Quizzes
  3. Gas Laws II | Week 3
    3 Topics
    |
    2 Quizzes
  4. Gas Laws III | Week 4
    3 Topics
    |
    2 Quizzes
  5. Gas Laws IV | Week 5
    3 Topics
    |
    2 Quizzes
  6. Mole Concept | Week 6
    5 Topics
    |
    2 Quizzes
  7. Acid, Bases and Salts I | Week 7
    7 Topics
    |
    2 Quizzes
  8. Acid, Bases and Salts II | Week 8
    6 Topics
    |
    2 Quizzes
  9. Acid, Bases and Salts III | Week 9
    3 Topics
    |
    2 Quizzes
  10. Acid, Bases and Salts IV | Week 10
    4 Topics
    |
    1 Quiz
  11. Acid, Bases and Salts V | Week 11
    5 Topics
    |
    1 Quiz



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Basicity of an acid is the number of replaceable hydrogen ions (H+) in one molecule of the acid.

Basicity of some Common Acids:

AcidBasicity
HCl  \(\scriptsize \leftrightharpoons \) H+ + Cl1 or monobasic
H2SO4 \(\scriptsize \leftrightharpoons \) 2H+   + SO42-2 or dibasic
H3PO4 \(\scriptsize \leftrightharpoons \) 3H+  + PO43-3 or tribasic
CH3COOH \(\scriptsize \leftrightharpoons \) H+  + CH3COO1 or monobasic

In organic acids like Ethanoic (CH3COOH), it is only the hydrogen atom in the carboxylic group (COOH) that is replaced. Hence, ethanoic Acid CH3COOH and methanoic acid, HCOOH that have four and two hydrogen atoms per molecule respectively, are both monobasic.

Methanoic Acid:
HCOOH \(\scriptsize \leftrightharpoons \)H+ + HCOO

Basicity = 1 i.e monobasic.

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