MDCAT Chemistry MCQ #2263

Comparing two acids, Acid X has a Ka of 1.8 x 10^-5 and Acid Y has a Ka of 4.5 x 10^-4. Which statement is correct?

MDCAT Chemistry MCQ #2263

  1. Question 1

    Q1. Comparing two acids, Acid X has a Ka of 1.8 x 10^-5 and Acid Y has a Ka of 4.5 x 10^-4. Which statement is correct?

    • A) The acid is weaker and has a higher pKa
    • B) The acid is stronger and has a lower pKa
    • C) The acid is stronger and has a higher pKa
    • D) The acid is weaker and has a lower pKa

    Answer: The acid is stronger and has a lower pKa

    Explanation: Stronger acids have larger Ka and smaller pKa values. Option A is wrong because Ka and acidity are directly proportional.