pKa value of carbonic acid is 6.4 what is pKb value of its conjugate base?
Correct answer: B. 7.6
- A. 14
- B. 7.6
- C. 6.4
- D. 10
Explanation
The key to solving this question is understanding the relationship between the pKa of an acid and the pKb of its conjugate base, which is given by the equation: pKa + pKb = 14. For carbonic acid with a pKa of 6.4, the pKb of its conjugate base can be calculated as 14 - 6.4 = 7.6. Therefore, the correct answer is Option B: 7.6. Other options do not correctly apply this relationship.
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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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