Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Acids, Alkalis and Titrations
83 practice questions
Topics covered
Practice questions
61–70 of 83
Question 61
3 marks · Easy
Answer and see the solution →(a)[1 mark]Titration Results Titration Initial burette reading / cm³ Final burette reading / cm³ 1 0.70 18.35 2 1.40 19.80 3 2.00 20.45 Calculate the titre (volume delivered) for Titration 1.
(b)[1 mark]Which titration is likely to be the rough (trial) titration? Give a reason for your answer.
(c)[1 mark]Suggest why the average titre is calculated using only concordant results.
Question 62
1 mark · Easy
Answer and see the solution →State the name of the procedure used to determine the volume of acid needed to neutralise a fixed volume of alkali.
Question 63
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe how you would add the alkali during a titration to obtain an accurate result.
(b)[1 mark]Explain why the conical flask should be swirled during the titration.
(c)[1 mark]State how the endpoint of the titration is recognised.
Question 64
2 marks · Easy
Answer and see the solution →A student starts a titration with the burette reading at 3.55 cm³. When the reaction is complete, the reading is 20.00 cm³. Calculate the volume of solution added from the burette.
Question 65
2 marks · Normal
Answer and see the solution →State the piece of apparatus used to measure out a precise volume of liquid in a titration, and the apparatus used to hold the liquid that is being titrated.
Question 66
4 marks · Normal
Answer and see the solution →A student wants to find out how much sodium hydroxide solution is needed to neutralise 25.0 cm³ of dilute hydrochloric acid using phenolphthalein as the indicator. Describe the main steps to carry out this titration accurately.
(a)[1 mark]State the first step to prepare the acid sample for titration.
(b)[1 mark]Describe how the student should handle the burette and indicator.
(c)[2 marks]Explain how to know when the endpoint is reached and what to do as it approaches.
Question 67
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 68
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 69
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 70
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