pH curves

Last updated: 11/02/2020

WJEC A-Level Chemistry Unit 3.9 – Acid-base equilibria pH curves

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Question 1 of 25

1. Question
Which device is used to measure pH?
- pH meter
- pH thermometer
- pH syringe
- Thermometer
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Question 2 of 25

2. Question
What is the definition of an equivalence point?
- The point at which a sufficient amount of base has been added to react with all of the acid
- The point where there is the same volume of acid compared to base
- The point within a neutralisation reaction where the end point has been met
- The point in a reaction where all reactants stop reacting and enough product has been formed
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Question 3 of 25

3. Question
Which of the following types of experiments can produce a pH curve?
- Titration
- Crystallisation
- Filtration
- Chromatography
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Question 4 of 25

4. Question
Which of the following types of reactions occur to produce a pH curve?
- Neutralisation
- Ionic
- Redox
- Thermal decomposition
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Question 5 of 25

5. Question
How is a pH curve formed?
- By adding a base to monoprotic acid
- By adding a weak base to a strong acid
- By adding a weak base to a weak acid
- By adding a strong base to a strong acid
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Question 6 of 25

6. Question
On a graph that shows a pH curve, how is the y-axis labelled?
- pH
- Volume of alkali
- Concentration
- Volume of gas
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Question 7 of 25

7. Question
On a graph that shows a pH curve, how is the x-axis labelled?
- Volume of alkali
- pH
- Concentration
- Volume of gas
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Question 8 of 25

8. Question
During a titration, what is added to show the end point of the neutralisation?
- Universal indicator
- Stronger base
- Stronger acid
- Distilled water
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Question 9 of 25

9. Question
What section of a pH curve shows the end point of a titration?
- Vertical section
- Area under the curve
- Initial pH
- Gradient
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Question 10 of 25

10. Question
What factor influences the initial pH of a pH curve?
- The strength of the acid
- The pressure of the base
- The pressure of the acid
- The strength of the base
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Question 11 of 25

11. Question
What factor influences the final pH of a pH curve?
- The strength of the base
- The pressure of the base
- The pressure of the acid
- The strength of the acid
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Question 12 of 25

12. Question
For a reaction between a strong acid and strong base, which of the following universal indicators would change at the equivalence point?
- Both methyl orange and phenolphthalein
- Neither methyl orange or phenolphthalein
- Phenolphthalein
- Methyl orange
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Question 13 of 25

13. Question
For a reaction between a strong acid and weak base, which of the following universal indicators would change at the equivalence point?
- Phenolphthalein
- Neither methyl orange or phenolphthalein
- Both methyl orange and phenolphthalein
- Methyl orange
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Question 14 of 25

14. Question
For a reaction between a weak acid and strong base, which of the following universal indicators would change at the equivalence point?
- Methyl orange
- Neither methyl orange or phenolphthalein
- Both methyl orange and phenolphthalein
- Phenolphthalein
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Question 15 of 25

15. Question
For a reaction between a weak acid and weak base, which of the following universal indicators would change at the equivalence point?
- Neither methyl orange or phenolphthalein
- Methyl orange
- Both methyl orange and phenolphthalein
- Phenolphthalein
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Question 16 of 25

16. Question
What colour does methyl orange turn when added to an acid?
- Red
- Yellow
- Pink
- Colourless
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Question 17 of 25

17. Question
What colour does methyl orange turn when added to a base?
- Yellow
- Red
- Pink
- Colourless
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Question 18 of 25

18. Question
What colour does phenolphthalein turn when added to an acid?
- Colourless
- Red
- Pink
- Yellow
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Question 19 of 25

19. Question
What colour does phenolphthalein turn when added to a base?
- Pink
- Red
- Yellow
- Colourless
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Question 20 of 25

20. Question
Which of the following combinations of pH curves has the largest vertical section?
- Strong acid and strong base
- Weak acid and weak base
- Weak acid and strong base
- Strong acid and weak base
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Question 21 of 25

21. Question
Which of the following combinations of pH curves has the smallest vertical section?
- Weak acid and weak base
- Strong acid and strong base
- Weak acid and strong base
- Strong acid and weak base
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Question 22 of 25

22. Question
Describe the relationship between the initial pH of a pH curve and the strength of the acid.
- The weaker the acid, the lower the pH
- The stronger the acid, the lower the pH
- The stronger the acid, the higher the pH
- No relationship
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Question 23 of 25

23. Question
Describe the relationship between the initial pH of a pH curve and the strength of the base.
- No relationship
- The stronger the base, the lower the pH
- The stronger the base, the higher the pH
- The weaker the base, the higher the pH
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Question 24 of 25

24. Question
Describe the relationship between the final pH of a pH curve and the strength of the acid.
- No relationship
- The stronger the acid, the lower the pH
- The stronger the acid, the higher the pH
- The weaker the acid, the lower the pH
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Question 25 of 25

25. Question
Describe the relationship between the final pH of a pH curve and the strength of the base.
- The stronger the base, the higher the pH
- No relationship
- The weaker the base, the higher the pH
- The stronger the base, the lower the pH
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