Which of the following shows the limit of the Ka value for a strong acid?
Correct answer: C. Kₐ>1
- A. Kₐ < 10⁻³
- B. Kₐ=1 to 10⁻³
- C. Kₐ>1
- D. Kₐ= 0
Explanation
A large Ka value means the acid dissociates almost completely, shifting equilibrium far to the right. Hence, Ka > 1 indicates a strong acid, while weak acids have Ka << 1.
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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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