Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Acids, Alkalis and Titrations
83 practice questions
Topics covered
Practice questions
11–12 of 12 · Hard
Question 11
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 12
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.