Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
611–620 of 869
Question 611
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 612
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 613
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 614
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 615
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 616
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 617
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 618
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 619
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 620
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.