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Chemistry: Acids & Bases Flashcards

7 cards from real AP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. The acid dissociation constant Ka of a weak acid is 1.0 × 10^-5. What is its pKa?

    Answer: 5

    pKa = -log(Ka) = -log(1.0 × 10^-5) = 5.

  2. Which of these is the strongest acid based on Ka values?

    Answer: Ka = 6.3 × 10^-3

    A larger Ka means greater dissociation, so 6.3 × 10^-3 is the strongest acid.

  3. What salt is produced when HCl reacts with NaOH?

    Answer: NaCl

    Neutralization of HCl with NaOH produces NaCl and water.

  4. An aqueous solution of NH4Cl is expected to be:

    Answer: Acidic

    The ammonium ion (NH4+) hydrolyzes to release H+, making the solution acidic.

  5. In the Lewis theory, an acid is a substance that:

    Answer: Accepts an electron pair

    A Lewis acid is an electron-pair acceptor.

  6. If [H+] in a solution is 2.0 × 10^-3 M, the approximate pH is:

    Answer: 2.7

    pH = -log(2.0 × 10^-3) ≈ 2.7.

  7. Which indicator would best signal the equivalence point of a strong acid–strong base titration?

    Answer: Either works well

    Strong acid–strong base titrations have a sharp pH jump around 7, so either indicator works.