Which of the following expression is correct?
Correct answer: C. Ka × Kb = 10-14
- A. Ka × Kb = pKw
- B. Ka × Kb = 14
- C. Ka × Kb = 10-14
- D. Ka × Kb = 1014
Explanation
The correct relationship between the ionization constants of an acid and its conjugate base is given by Ka × Kb = Kw. At 25°C, the ionization constant of water (Kw) is 10-14. Therefore, the expression Ka × Kb = 10-14 is correct. Option A is incorrect because it confuses Kw with its logarithmic form pKw. Option B is incorrect as it incorrectly equates the product to 14 instead of 10-14. Option D is incorrect because it incorrectly displays the product as 1014, which is the inverse of the correct value.
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