Calculate the pH of weak acids – Primrose Kitten

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Calculate the pH of weak acids

Last updated: 11/02/2020

Oxford AQA International A-Level Chemistry Acids and bases Calculate the pH of weak acids

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Question 1 of 40

1. Question
Which chemist measured hydrogen ion concentrations?
- Soren Sorensen
- George Arrhenius
- Joseph Priestley
- Humphrey Davy
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Incorrect
Question 2 of 40

2. Question
What type of brackets show concentration?
- Square
- Round
- Oval
- No brackets
Correct

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Question 3 of 40

3. Question
How is the concentration of hydrogen ions written?
- $[H^+]$
- ${H^-}$
- $H^+$
- $(H^+)$
Correct

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Question 4 of 40

4. Question
What is the definition of a strong acid?
- An acid that completely dissociates in solution
- An acid that donates two protons
- An acid that donates a proton
- An acid that partially dissociates in solution
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Question 5 of 40

5. Question
What is the definition of a weak acid?
- An acid that partially dissociates in solution
- An acid that donates two protons
- An acid that donates a proton
- An acid that completely dissociates in solution
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Question 6 of 40

6. Question
Describe the concentration of hydrogen ions for a strong acid.
- The concentration of hydrogen ions is higher than the concentration of the acid
- The concentration of hydrogen ions is smaller than the concentration of the acid
- The concentration of hydrogen ions is the same as the concentration of the acid
- The concentration of hydrogen ions is not equal to the concentration of the acid
Correct

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Question 7 of 40

7. Question
Describe the concentration of hydrogen ions for a weak acid.
- The concentration of hydrogen ions is not equal to the concentration of the acid
- The concentration of hydrogen ions is smaller than the concentration of the acid
- The concentration of hydrogen ions is the same as the concentration of the acid
- The concentration of hydrogen ions is higher than the concentration of the acid
Correct

Incorrect
Question 8 of 40

8. Question
What happens to the concentration of hydrogen ions when a strong acid fully dissociates?
- The concentration of hydrogen ions is the same as the concentration of the acid
- The concentration of hydrogen ions is smaller than the concentration of the acid
- The concentration of hydrogen ions is higher than the concentration of the acid
- There is a low concentration of hydrogen ions
Correct

Incorrect
Question 9 of 40

9. Question
What happens to the concentration of hydrogen ions when a weak acid partially dissociates?
- The concentration of hydrogen ions is higher than the concentration of the acid
- The concentration of hydrogen ions is smaller than the concentration of the acid
- The concentration of hydrogen ions is the same as the concentration of the acid
- The concentration of hydrogen ions is not equal to the concentration of the acid
Correct

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Question 10 of 40

10. Question
Which of the following are a strong acid?
- Hydrochloric acid
- Ammonia
- Ethanoic acid
- Phosphoric acid
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Question 11 of 40

11. Question
Which of the following are a strong acid?
- Nitric acid
- Sodium hydroxide
- Ammonia
- Ethanoic acid
Correct

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Question 12 of 40

12. Question
Which of the following are a weak acid?
- Methanoic acid
- Ammonia
- Hydriodic acid
- Hydrochloric acid
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Question 13 of 40

13. Question
Which of the following are a weak acid?
- Phosphoric acid
- Sodium hydroxide
- Sulfuric acid
- Nitric acid
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Question 14 of 40

14. Question
Write the dissociation equation for ethanoic acid.
- $CH_3COOH(aq) -> CH_3COO^-(aq) + H^+(aq)$
- $CH_3COOH(aq) -> CH_3COO^-(aq) + H_2O(aq)$
- $CH_3COOH(aq) -> CH_3COOH^-(aq) + H^+(aq)$
- $CH_3COOH(aq) -> CH_3COO^-(aq)$
Correct

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Question 15 of 40

15. Question
Write the ionic equation for the reaction between hydrochloric acid and sodium carbonate.
- $CO_3^{2-}(aq) + 2H^+(aq) -> H_2O(l) + CO_2(g)$
- $H^+(aq) + OH^-(aq) -> H_2O(l) + CO_2(g)$
- $CO_3(aq) + H(aq) -> H_2O(l) + CO_2(g)$
- $CO_3^{2-}(aq) + H^+ (aq) -> H_2O(l) + CO_2(g)$
Correct

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Question 16 of 40

16. Question
What equation is used to find the concentration of H $^+$ ions?
- $10^{-pH}$
- $-log[pH]$
- $log[pH]$
- $-10^{-pH}$
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Question 17 of 40

17. Question
What equation is used to find pH?
- $-log[H^+]$
- $10^{H^+}$
- $log[H^+]$
- $-10^{-H^+}$
Correct

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Question 18 of 40

18. Question
Which resource is needed to determine the pH of a weak acid?
- pH meter
- Titration
- Universal indicator
- Colorimeter
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Question 19 of 40

19. Question
Describe the concentration of hydrogen ions when an acid has a high pH value.
- Low concentration of hydrogen ions
- High concentration of hydrogen ions
- Concentration will depend on the type of indicator used
- Concentration will depend on the strength of the acid
Correct

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Question 20 of 40

20. Question
Describe the concentration of hydrogen ions when an acid has a low pH value.
- High concentration of hydrogen ions
- Low concentration of hydrogen ions
- Concentration will depend on the type of indicator used
- Concentration will depend on the strength of the acid
Correct

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Question 21 of 40

21. Question
What equilibrium constant is used to find the concentration of H $^+$ ions of a weak acid when it is partially dissociated?
- K $_a$
- K $_w$
- K $_c$
- K $_p$
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Question 22 of 40

22. Question
What is the symbol for the acid dissociation?
- K $_a$
- K $_p$
- K $_c$
- K $_w$
Correct

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Question 23 of 40

23. Question
What equation is used to find K $_a$ ?
- $10^{-pK_a}$
- $-log pK_a$
- $log pK_a$
- $-10^{-pK_a}$
Correct

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Question 24 of 40

24. Question
What equation is used to find pK $_a$ ?
- $-log K_a$
- $10^{-K_a}$
- $log K_a$
- $-10^{-K_a}$
Correct

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Question 25 of 40

25. Question
What is the equation to find the acid dissociation constant?
- $K_a =[A^-][H^+] / [HA]$
- $K_a =[HA]/[A^-][H^+]$
- $K_a =[H^+][HA]$
- $K_a =[A^-][H^+][HA]$
Correct

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Question 26 of 40

26. Question
What are the units for K $_a$ ?
- $mol dm^{-3}$
- $mol^{-2} dm^6$
- $mol^{-3} dm^9$
- $mol dm^{-3} s^{-1}$
Correct

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Question 27 of 40

27. Question
Which resource is needed to determine the K $_a$ of a strong acid?
- pH meter
- Titration
- Universal indicator
- Colorimeter
Correct

Incorrect
Question 28 of 40

28. Question
Which resource is needed to determine the K $_a$ of a weak acid?
- pH meter
- Titration
- Universal indicator
- Colorimeter
Correct

Incorrect
Question 29 of 40

29. Question
Write the equation for the dissociation of a weak acid in terms of HA.
- $HA(aq) ⇌ H^+(aq) + A^-(aq)$
- $HA(aq) ⇌ H^-(aq) + A^+(aq)$
- $H(aq) ⇌ H^+(aq) + A^-(aq)$
- $HA(aq) ⇌ HA^+(aq) + H^-(aq)$
Correct

Incorrect
Question 30 of 40

30. Question
For the dissociation of weak acids, describe the difference between the concentration of hydrogen ions and [HA].
- The concentration of hydrogen ions is smaller than [HA]
- The concentration of hydrogen ions is equal to [HA]
- The concentration of hydrogen ions and [HA] have the same pH
- The concentration of hydrogen ions is larger than [HA]
Correct

Incorrect
Question 31 of 40

31. Question
For strong acids, how can the concentration of hydrogen ions be found?
- Use the concentration of HA
- Use the inverse log
- Use the concentration of A $^-$
- Square root the concentration of A $^-$
Correct

Incorrect
Question 32 of 40

32. Question
In terms of the acid dissociation constant, which of the following assumptions are made?
- $[H^+] = [A^-]$
- $[H^+] = [HA]$
- $[H^+] = [A^-] = [HA]$
- $[A^-] = [HA]$
Correct

Incorrect
Question 33 of 40

33. Question
In terms of the acid dissociation constant, which of the following assumptions are made?
- $[H^+]^2$
- $[A^-]^2$
- $[H^+]^3$
- $[HA]^2$
Correct

Incorrect
Question 34 of 40

34. Question
Using the assumption that [H $^+$ ] = [A $^-$ ] when a weak acid dissociates, how can the K $_a$ equation now be written?
- $[H^+]^2 / [HA]$
- $[H^+] / [HA]$
- $[HA] / [HA]^2$
- $[H^+] / [HA]^2$
Correct

Incorrect
Question 35 of 40

35. Question
Describe the extent of dissociation for an acid with a large K $_a$ value.
- Strong dissociation
- Weak dissociation
- Neutral dissociation
- No dissociation
Correct

Incorrect
Question 36 of 40

36. Question
Describe the extent of dissociation for an acid with a small K $_a$ value.
- Weak dissociation
- Strong dissociation
- Neutral dissociation
- No dissociation
Correct

Incorrect
Question 37 of 40

37. Question
Describe the extent of dissociation for an acid with a large pK $_a$ value.
- Weak dissociation
- Strong dissociation
- Neutral dissociation
- No dissociation
Correct

Incorrect
Question 38 of 40

38. Question
Describe the extent of dissociation for an acid with a small pK $_a$ value.
- Strong dissociation
- Weak dissociation
- Neutral dissociation
- No dissociation
Correct

Incorrect
Question 39 of 40

39. Question
Describe the relationship between the value of K $_a$ and the strength of an acid.
- The stronger the acid the larger the value of K $_a$
- The stronger the acid the smaller the value of K $_a$
- No relationship
- It will depend on the type of acid
Correct

Incorrect
Question 40 of 40

40. Question
Describe the relationship between the value of pK $_a$ and the strength of an acid.
- The stronger the acid the smaller the value of pK $_a$
- The stronger the acid the larger the value of pK $_a$
- No relationship
- It will depend on the type of acid
Correct

Incorrect

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