PAG 2.1 – Determination of the concentration of hydrochloric acid

Last updated: 11/03/2020

OCR-A A-Level Chemistry Acids PAG 2.1 – Determination of the concentration of hydrochloric acid

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Question 1 of 25

1. Question
Write the equation for the reaction between hydrochloric acid and sodium hydrogen carbonate.
- $HCl + NaHCO_3 -> NaCl + H_2O + CO_2$
- $HCl + NaHCO_3 -> NaCl + CO_2$
- $HCl + NaHCO_3 -> NaCl + H_2O$
- $HCl + NaHCO_3 -> NaCl + H_2 + CO_2$
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Question 2 of 25

2. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, what type of volumetric flask should be used?
- 250 cm $^3$
- 50 cm $^3$
- 100 cm $^3$
- 200 cm $^3$
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Question 3 of 25

3. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, what type of beaker should be used?
- 100 cm $^3$
- 50 cm $^3$
- 250 cm $^3$
- 200 cm $^3$
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Question 4 of 25

4. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, how much sodium hydrogen carbonate should be measured out?
- 2.20 grams
- 1.50 grams
- 1.20 grams
- 2.50 grams
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Question 5 of 25

5. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, what type of conical flask should be used?
- 250 cm $^3$
- 50 cm $^3$
- 100 cm $^3$
- 200 cm $^3$
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Question 6 of 25

6. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, how much of the sodium hydrogen carbonate solution should be used within the titration?
- 25 cm $^3$
- 50 cm $^3$
- 100 cm $^3$
- 150 cm $^3$
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Question 7 of 25

7. Question
What is the definition of a standard solution?
- A solution where concentrations are known
- A solution where concentrations are unknown
- A solution containing an acid
- A solution containing an acid
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Question 8 of 25

8. Question
What state is sodium hydrogen carbonate?
- Solid
- Liquid
- Gaseous
- Aqueous
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Question 9 of 25

9. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, what other compound should be added to a beaker containing hydrogen carbonate?
- Distilled water
- Ethanol
- Sodium carbonate
- Hydrochloric acid
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Question 10 of 25

10. Question
What should be used to transfer a solution to a volumetric flask?
- Funnel
- Buncher funnel
- Beaker
- Pipette
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Question 11 of 25

11. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, what should be used to stir the sodium hydrogen carbonate and distilled water?
- Glass rod
- Spatula
- Spoon
- Pipette
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Question 12 of 25

12. Question
Once the solution of sodium hydrogen carbonate and distilled water is transferred to the volumetric flask, what should be done?
- Solution should be shaken
- Solution should be heated
- Solution should be heated under reduced pressure
- Solution should be refluxed
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Question 13 of 25

13. Question
Which type of flask should the sodium hydrogen carbonate solution be made up in?
- Volumetric flask
- Buchner flask
- Conical flask
- Separating flask
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Question 14 of 25

14. Question
Which type of flask should the sodium hydrogen carbonate solution be in when the titration is taking place?
- Conical flask
- Buchner flask
- Conical flask
- Separating flask
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Question 15 of 25

15. Question
What should be used to transfer the sodium hydrogen carbonate solution into a conical flask?
- Pipette
- Spatula
- Beaker
- Spoon
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Question 16 of 25

16. Question
When carrying out a titration between sodium hydrogen carbonate and hydrochloric acid, what should be added to the conical flask?
- Methyl orange
- Distilled water
- Hydrochloric acid
- Phenolphthalein
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Question 17 of 25

17. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, which compound is added to the conical flask?
- Sodium hydrogen carbonate
- Sodium hydroxide
- Hydrochloric acid
- Distilled water
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Question 18 of 25

18. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, which compound is added to the burette?
- Hydrochloric acid
- Sodium hydroxide
- Sodium hydrogen carbonate
- Distilled water
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Question 19 of 25

19. Question
When carrying out an experiment to determine the concentration of hydrochloric, what type of reaction needs to take place?
- Titration
- Disproportionation
- Hydrolysis
- Hydrogenation
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Question 20 of 25

20. Question
When carrying out an experiment to determine the concentration of hydrochloric acid via a titration, when should the hydrochloric acid stop being added?
- When an end point has been reached
- When reactants have all been used up
- At 100 cm $^3$
- At 200 cm $^3$
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Question 21 of 25

21. Question
Once a concordant set of results have been gathered, what should be calculated?
- The mean titre
- The average concentration
- The volume differences
- The concentration of sodium hydrogen carbonate
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Question 22 of 25

22. Question
What is the definition of concordant results?
- Consistent results
- The same results
- Results from the same experiment
- Results from the same compounds used
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Question 23 of 25

23. Question
What gas is released during the reaction between hydrochloric acid and sodium hydrogen carbonate?
- Carbon dioxide
- Carbon monoxide
- Oxygen
- Hydrogen
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Question 24 of 25

24. Question
What salt is formed during the reaction between hydrochloric acid and sodium hydrogen carbonate?
- Sodium chloride
- Sodium hydride
- Sodium sulfate
- Chlorine
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Question 25 of 25

25. Question
When should a titration stop be being repeated?
- When two sets of concordant results are achieved
- When three sets of concordant results are achieved
- When four sets of concordant results are achieved
- When all compounds have been used up
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