Very large value of pKa means the solution is
Correct answer: B. Weakly acidic
- A. Strongly basic
- B. Weakly acidic
- C. Basic
- D. Acidic
Explanation
The pKa value is a critical measure of an acid's strength; it is inversely proportional to the acid's ability to donate protons. A very large pKa value signifies a weak acid, meaning it donates protons inefficiently, leading to a solution that is weakly acidic. This is why Option B is correct. Options A and C mistakenly equate a weak acid with a basic solution, which is incorrect unless strong bases are present. Option D is incorrect because a large pKa denotes weak, not strong, acidity.
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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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