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PH and pOH Knowledge-Based Practice

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

5 Chemistry practice questions on PH and pOH. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    An aqueous solution of barium hydroxide, Ba(OH)2\text{Ba(OH)}_2, has a concentration of 5.0×10−3 M5.0 \times 10^{-3}\text{ M} at 25 °C. What is the pH of this solution?

    • A) 2.0
    • B) 12.0
    • C) 11.7
    • D) 2.3
  2. 2.

    In an aqueous solution at 25 °C, the difference between the pOH and the pH is 4.0, such that pOH−pH=4.0\text{pOH} - \text{pH} = 4.0. What is the hydroxide ion concentration, [OH−][\text{OH}^-], of this solution?

    • A) 1.0×10−4 M1.0 \times 10^{-4}\text{ M}
    • B) 1.0×10−5 M1.0 \times 10^{-5}\text{ M}
    • C) 1.0×10−9 M1.0 \times 10^{-9}\text{ M}
    • D) 1.0×10−10 M1.0 \times 10^{-10}\text{ M}
  3. 3.

    The pH of an aqueous solution at 25 °C is decreased from 5.0 to 2.0 by the addition of a strong acid. By what factor does the hydroxide ion concentration, [OH−][\text{OH}^-], decrease in this solution?

    • A) 10310^3
    • B) 10210^2
    • C) 33
    • D) 10710^7
  4. 4.

    At 25 °C, the ratio of hydronium ion concentration to hydroxide ion concentration, [H3O+]/[OH−][\text{H}_3\text{O}^+]/[\text{OH}^-], in an aqueous solution is 1.0×1041.0 \times 10^4. What is the pH of this solution?

    • A) 5.0
    • B) 4.0
    • C) 9.0
    • D) 10.0
  5. 5.

    An aqueous solution at 25 °C has a hydroxide ion concentration of 2.0×10−42.0 \times 10^{-4} M. Given that log⁡2=0.30\log 2 = 0.30, what is the pH of this solution?

    • A) 3.70
    • B) 10.30
    • C) 4.30
    • D) 9.70

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