Which of the following shows the limit of Ka value for strong acid?
Correct answer: C. Ka > 1
- A. Ka < 10-3
- B. Ka = 1 to 10-3
- C. Ka > 1
- D. Ka = 0
Explanation
The strength of an acid is determined by its ability to donate protons, which is indicated by its acid dissociation constant, Ka. A strong acid dissociates almost completely in solution, resulting in a high Ka value. Therefore, strong acids have Ka values greater than 1. Option C is correct as it correctly represents the Ka value for strong acids. Option A and B suggest Ka values that are too low for strong acids, indicating weaker acids. Option D is not feasible for an acid, as a Ka of 0 would mean no dissociation occurs.
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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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