pKa values of four solutions are given below, which one is more acidic?
Correct answer: B. 10-4
- A. 10-3
- B. 10-4
- C. 250
- D. 10-2
Explanation
The acidity of a solution is inversely related to its pKa value; the lower the pKa, the stronger the acid. Therefore, among the given options, the solution with a pKa of 10-4 is the most acidic. Options with pKa values of 10-3 and 10-2 are less acidic, and a pKa of 250 indicates a very weak acid.
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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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