12.2.1 pH of strong acids and bases, and Kw Quiz: Pearson Edexcel Chemistry, Unit 12

The 20 questions

1. What is the ionic product of water, Kw, at 298 K?

   • 1.00 x 10^-7 mol2 dm-6
   • 1.00 mol2 dm-6
   • 1.00 x 10^-14 mol2 dm-6
   • 1.00 x 10^7 mol2 dm-6

2. In pure water at 298 K, what is [H+]?

   • 1.00 x 10^-14 mol dm-3
   • 1.00 x 10^-7 mol dm-3
   • 1.00 x 10^-1 mol dm-3
   • 1.00 mol dm-3

3. What is the pH of 0.100 mol dm-3 hydrochloric acid, a strong acid?

   • 1.00
   • 0.10
   • 7.00
   • 13.00

4. What is the pH of 0.0100 mol dm-3 sulfuric acid, which is fully dissociated to give two H+ per molecule?

   • 12.00
   • 1.70
   • 1.00
   • 2.00

5. What is the pH of 0.0200 mol dm-3 sodium hydroxide, a strong base?

   • 1.70
   • 11.70
   • 2.00
   • 12.30

6. What is [OH-] in a solution of pH 10.0 at 298 K?

   • 1.0 x 10^-14 mol dm-3
   • 10.0 mol dm-3
   • 1.0 x 10^-4 mol dm-3
   • 1.0 x 10^-10 mol dm-3

7. Which expression correctly gives the pH of a strong base of concentration c mol dm-3 at 298 K?

   • pH = -log10(c)
   • pH = 14 - log10(c)
   • pH = log10(c) only
   • pH = 14 + log10(c)

8. A solution of a strong acid is diluted 10 times. Which pH change is expected for a strong acid starting at pH 3.00?

   • pH 2.00
   • pH 3.00 unchanged
   • pH 4.00
   • pH 3.10

9. Upon dilution with water, how does the pH change of a weak acid compare to a strong acid?

   • It changes identically
   • It changes less
   • It changes more
   • It decreases

10. What is the hydroxide ion concentration in a solution of pH 13.0 at 298 K?

    • 0.010 mol dm-3
    • 13 mol dm-3
    • 0.10 mol dm-3
    • 1.0 mol dm-3

11. What is the pH of 0.00100 mol dm-3 hydrochloric acid?

    • 3.00
    • 11.00
    • 0.00100
    • 1.00

12. What happens to the ionic product of water, Kw, as temperature increases?

    • It decreases
    • It stays constant
    • It becomes zero
    • It increases

13. What is the pH of 2.00 x 10^-3 mol dm-3 HNO3? (log10 2 = 0.30)

    • 3.30
    • 2.00
    • 2.70
    • 11.30

14. For a strong acid of pH 2.00, what is the concentration of H+ ions in mol dm-3?

    • 1.0 x 10^-2 mol dm-3
    • 2.0 mol dm-3
    • 0.20 mol dm-3
    • 1.0 x 10^-12 mol dm-3

15. What is the pH of 0.0500 mol dm-3 calcium hydroxide, Ca(OH)2, a strong base giving two OH- per formula unit? (log10 1.0 = 0)

    • 12.00
    • 13.00
    • 1.30
    • 12.70

16. Which expression gives [H+] from Kw and [OH-] in a strong base solution?

    • [H+] = Kw / [OH-]
    • [H+] = [OH-] / Kw
    • [H+] = Kw - [OH-]
    • [H+] = Kw x [OH-]

17. A student adds 1.00 cm3 of 1.00 mol dm-3 HCl to 999 cm3 of water. What is the pH of the solution?

    • 3.00
    • 7.00
    • 1.00
    • 0.00

18. For a strong monoprotic acid, what equals the hydrogen ion concentration?

    • Water concentration
    • Zero
    • Acid concentration
    • Hydroxide ion concentration

19. What is the pH of 1.0 × 10^-8 mol dm^-3 hydrochloric acid?

    • Equal to 14
    • Equal to 8
    • Equal to 6
    • Close to 7

20. What is the pH of 0.250 mol dm-3 sodium hydroxide? (log10 4 = 0.60)

    • 13.40
    • 0.60
    • 12.00
    • 14.60

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