Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Acids, Alkalis and Titrations
83 practice questions
Topics covered
Practice questions
51–60 of 83
Question 51
2 marks · Normal
Answer and see the solution →State the formula of the ion present in all alkaline solutions and give its charge.
Question 52
4 marks · Normal
Answer and see the solution →Some cleaning products are described as 'alkaline'.
(a)[2 marks]Ammonia is commonly found in cleaning products. State the ions that are produced when ammonia reacts with water.
(b)[2 marks]Explain why solutions of ammonia are described as alkaline.
Question 53
3 marks · Normal
Answer and see the solution →A student adds hydrochloric acid (HCl), at a concentration of 0.020 mol/dm³, to water. Hydrochloric acid completely dissociates into ions:
Calculate the concentration of hydrogen ions (H⁺) in the solution after the HCl fully dissociates. Explain your reasoning.
Question 54
2 marks · Hard
Answer and see the solution →State the name and the full chemical formula of the ion that is present in all acidic solutions and causes acidity.
Question 55
5 marks · Hard
Answer and see the solution →The following table shows two acids and their reactions in water.
Acid Equation in water Acid A Acid B (a)[1 mark]For Acid A, explain what the presence of H^+ ions in solution tells you about the nature of the solution.
(b)[1 mark]For Acid B, how many moles of H^+ ions are formed from 1 mole of HB_2?
(c)[2 marks]Both Acid A and Acid B are added separately to water to make solutions.
Describe in terms of ions what occurs in each solution and which property they share.
(d)[1 mark]Explain, using one example from above, what is meant by the 'replaceable hydrogen' in acids.
Question 56
2 marks · Hard
Answer and see the solution →Name one metal compound (other than ammonia or sodium hydroxide) that makes water alkaline and write a balanced equation to show the formation of hydroxide ions in this solution.
Question 57
1 mark · Easy
Answer and see the solution →Name the piece of apparatus used to deliver small, measured volumes of acid into a conical flask during a titration.
Question 58
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the colour change you would see when phenolphthalein is used as the indicator and the alkali in the conical flask is just neutralised by the acid from the burette.
(b)[1 mark]Give one reason why phenolphthalein is preferred over universal indicator for titrations.
(c)[1 mark]Name the flask used to hold the solution during a titration.
Question 59
2 marks · Easy
Answer and see the solution →During a titration, a student records an initial burette reading of 6.40 cm³ and a final reading of 28.15 cm³. Calculate the volume of solution delivered from the burette.
Question 60
2 marks · Easy
Answer and see the solution →Explain why titration readings should be recorded to two decimal places.