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PH of weak acids and bases Knowledge-Based Practice

Chemistry · Acids & Bases · Chemistry · Acid–Base Equilibria

5 Chemistry practice questions on PH of weak acids and bases. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    What is the percent ionization of a 0.50 M aqueous solution of acetic acid (CH3COOH\text{CH}_3\text{COOH}) at 25 °C? (Ka=1.8×10−5K_\text{a} = 1.8 \times 10^{-5} at 25 °C)

    • A) 0.15%
    • B) 0.30%
    • C) 0.60%
    • D) 3.0%
  2. 2.

    A 0.20 M aqueous solution of a weak monoprotic acid HA has a pH of 3.00 at 25 °C. What is the acid dissociation constant (KaK_\text{a}) of HA at this temperature?

    • A) 1.0×10−61.0 \times 10^{-6}
    • B) 5.0×10−35.0 \times 10^{-3}
    • C) 2.0×10−52.0 \times 10^{-5}
    • D) 5.0×10−65.0 \times 10^{-6}
  3. 3.

    A 0.050 M aqueous solution of a weak monoprotic acid is 2.0% ionized at 25 °C. What is the pH of this solution?

    • A) 1.30
    • B) 2.00
    • C) 3.00
    • D) 4.69
  4. 4.

    What is the pH of a 0.040 M aqueous solution of a weak monoprotic acid HA with an acid dissociation constant Ka=2.5×10−5K_\text{a} = 2.5 \times 10^{-5} at 25 °C?

    • A) 3.00
    • B) 4.60
    • C) 1.40
    • D) 6.00
  5. 5.

    What is the pH of a 0.10 M aqueous solution of a weak monoprotic base B with a base dissociation constant Kb=1.0×10−5K_\text{b} = 1.0 \times 10^{-5} at 25 °C?

    • A) 3.00
    • B) 5.00
    • C) 11.00
    • D) 13.00

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