Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Titration
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →During a titration, a student records the following burette readings:
Titration readings Initial reading / cm³ Final reading / cm³ 4.10 21.80 Question 12
3 marks · Normal
Answer and see the solution →Explain why phenolphthalein is a better choice of indicator for an acid–alkali titration than universal indicator. Include two reasons in your answer.
Question 13
4 marks · Normal
Answer and see the solution →Look at the following table of titration results.
Titration results Titration Initial reading / cm³ Final reading / cm³ 1 1.50 23.40 2 2.20 24.10 3 1.70 23.60 (a)[2 marks]Calculate the volume of sodium hydroxide used in each titration.
(b)[1 mark]Suggest which, if any, of the three titrations should be considered an outlier. Give a reason.
(c)[1 mark]State why titrations are repeated.
Question 14
1 mark · Normal
Answer and check →In an acid-alkali titration, which piece of apparatus is used to add the alkali to the acid?
- A.Burette
- B.Measuring cylinder
- C.Pipette
- D.Test tube
Question 15
4 marks · Normal
Answer and see the solution →The steps below are used in a titration experiment to find the volume of sulfuric acid needed to neutralise 25.0 cm³ of potassium hydroxide solution.
(a)[1 mark]State how the potassium hydroxide solution should be measured and transferred to the flask.
(b)[2 marks]Name a suitable indicator for this titration, and state the expected colour change at the endpoint.
(c)[1 mark]Explain why it is important to read the burette at eye level.
Question 16
2 marks · Normal
Answer and see the solution →Describe two key steps you would take to accurately find the volume of sulfuric acid needed to neutralise a fixed amount of sodium hydroxide solution using a titration. Do not include any calculation steps.
Question 17
2 marks · Hard
Answer and see the solution →State two steps you must carry out before starting to add alkali from a burette in a titration experiment between hydrochloric acid and sodium hydroxide. Do not include steps taken during or after the addition of alkali.
Question 18
5 marks · Hard
Answer and see the solution →A student is asked to carry out an acid-alkali titration to determine the volume of sulfuric acid needed to neutralise 25.0 cm³ of sodium hydroxide solution.
(a)[2 marks]Describe, in order, four steps the student should take to set up the experiment before beginning the titration.
(b)[2 marks]Explain why phenolphthalein is a suitable indicator for this titration, and why universal indicator should not be used.
(c)[1 mark]State how the student would recognise the endpoint of the titration.
Question 19
2 marks · Hard
Answer and see the solution →During a titration, a student adds hydrochloric acid to sodium hydroxide solution from a burette. The student does a 'rough titration' first, then repeats the procedure more carefully. Explain the purpose of doing a rough titration, and describe one way to increase accuracy when repeating the titration.