Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making sodium, potassium and ammonium salts
18 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Explain why methyl orange is a suitable indicator for titrations involving sodium hydroxide and hydrochloric acid. In your answer, mention what the colour change shows about the reaction mixture.
Question 2
5 marks · Hard
Answer and see the solution →A student is asked to prepare pure ammonium sulfate crystals using ammonia solution and dilute sulfuric acid in the laboratory.
(a)[2 marks]Explain why the titration method must be used instead of the excess solid method for this preparation.
(b)[2 marks]State two practical reasons why an indicator is not added to the acid and alkali mixture when making the final batch of ammonium sulfate for crystallisation.
(c)[1 mark]Describe what the student should do after mixing the correct volumes of acid and alkali, to obtain pure, dry crystals of ammonium sulfate.
Question 3
2 marks · Hard
Answer and see the solution →Give two steps the student must follow to make pure potassium chloride crystals using titration and crystallisation with potassium hydroxide and hydrochloric acid.