Pka value of phenol is
Correct answer: B. 8.9
- A. 7.9
- B. 8.9
- C. 9.9
- D. 10.9
Explanation
Phenol is a weak acid with a pKa of approximately 8.9, which reflects its ability to donate a proton. The pKa value is crucial in understanding the relative acidity of a compound; the lower the pKa, the stronger the acid. Option B correctly identifies the pKa of phenol as 8.9. Option A is incorrect because it suggests phenol is a stronger acid than it is. Options C and D are incorrect because they suggest phenol is weaker than it actually is, with increasing pKa values indicating decreasing 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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