pKa values of some acids are given below. Choose the weaker acid:
Correct answer: C. H2SO4(-3)
- A. HClO4(-10)
- B. HBr(-9)
- C. H2SO4(-3)
- D. HCl(-7)
Explanation
The strength of an acid is inversely proportional to its pKa value. A lower pKa value indicates a stronger acid. Among the given options, H2SO4 has the highest pKa value of -3, making it the weakest acid. In contrast, HClO4 with a pKa of -10 is the strongest, followed by HBr (-9), and then HCl (-7).
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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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