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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. Which oxide, when dissolved in water, produces an acidic solution?

    Answer: SO3

    SO3 reacts with water to form sulfuric acid, giving an acidic solution.

  2. The conjugate acid of ammonia (NH3) is:

    Answer: NH4+

    Adding a proton to NH3 produces the ammonium ion NH4+.

  3. A solution with pH = 7 at 25 °C is best described as:

    Answer: Neutral

    At 25 °C, pH 7 means [H+] = [OH-], which is neutral.

  4. Which of the following salts forms a basic solution when dissolved in water?

    Answer: CH3COONa

    The acetate ion from a weak acid hydrolyzes to make the solution basic.

  5. As temperature increases, the value of Kw for water:

    Answer: Increases

    Water's self-ionization is endothermic, so Kw increases with temperature.

  6. What is [OH-] in a solution with pH = 9 at 25 °C?

    Answer: 1 × 10^-5 M

    pOH = 14 - 9 = 5, so [OH-] = 10^-5 M.

  7. Which acid is classified as strong because it ionizes essentially completely in water?

    Answer: HNO3

    Nitric acid (HNO3) is a strong acid that ionizes completely in water.