The pKb values of four solutions are given below. Which one is the most acidic?
Correct answer: C. 5
- A. 3
- B. 4
- C. 5
- D. 2
Explanation
A higher pKb value indicates a weaker base. A weaker base corresponds to a stronger conjugate acid and thus a more acidic solution. Therefore, the solution with the highest pKb (5) will be the most acidic.
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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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