This relation Ka × 1/Kb shows that
Correct answer: C. Strong acid have weak conjugate base
- A. Weak acid have weak conjugate base
- B. Strong acid have strong conjugate base
- C. Strong acid have weak conjugate base
- D. Strong base have strong conjugate acid
Explanation
The relation Ka × 1/Kb is derived from the ionization constants of acids and bases. For a strong acid, the acid dissociation constant (Ka) is large, indicating that the acid dissociates completely in solution. Its conjugate base, therefore, has a low tendency to accept protons, making it weak. Thus, a strong acid has a weak conjugate base. Option A is incorrect because a weak acid typically has a stronger conjugate base. Option B is incorrect because a strong acid does not have a strong conjugate base. Option D is incorrect because a strong base has a weak conjugate acid.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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