plumiReactions of metal ions with sodium hydroxide and ammonia: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.2.3 Reactions of metal ions with sodium hydroxide and ammonia, 2019–2025, with mark schemes and examiner’s reports where available.
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All 51 questions on Reactions of metal ions with sodium hydroxide and ammonia, as a list
- June 2025, Unit 5, Q19 (6 marks): *19 A solution containing tetrachlorocuprate(II) ions, [CuCl4] 2−, is treated with dilute aqueous ammonia. The ammonia solution is added gradually. The followin
- June 2025, Unit 6, Q1(a)(ii) (1 mark): Add excess aqueous A pale brown precipitate sodium hydroxide to a forms, which darkens of the cation solution of A and leave to in A is on standing. stand in ai
- June 2025, Unit 6, Q1(b)(i) (3 marks): Write ionic equations to account for the following observations. State symbols are not required. (3) Formation of green precipitate in Test 1 Formation of gas t
- June 2025, Unit 6, Q1(b)(ii) (1 mark): The brown precipitate from Test 1 was dissolved in sulfuric acid. A yellow-brown solution formed. Give the formula of the complex ion present in the yellow-brow
- June 2025 (A), Unit 5, Q16(b) (3 marks): Explain why aqueous solutions of some complex ions are acidic by comparing the data in the table. (3) pH of a solution of Complex ion formula concentration of 1
- January 2025, Unit 5, Q20(a)(iii) (2 marks): Give the formula of the species responsible for the purple colour formed in Reaction 3, naming the type of reaction that occurs. (2)
- January 2025, Unit 5, Q21(c) (2 marks): Suggest why iron(II) sulfate is acidic when dissolved in water. (2)
- January 2025, Unit 6, Q1(a)(i) (1 mark): Give the colour of the solution formed. (1)
- January 2025, Unit 6, Q1(b)(i) (1 mark): State the formula of Q. (1)
- January 2025, Unit 6, Q1(d)(i) (1 mark): Give the formula of the complex ion that forms the green colour. (1)
- January 2025, Unit 6, Q1(d)(ii) (1 mark): Name the type of reaction that has taken place. (1)
- October 2024, Unit 5, Q5 (1 mark): Chromium(III) hydroxide, Cr(OH)3(H2O)3 , is amphoteric. This means that chromium(III) hydroxide dissolves in A water B strong acid only C strong alkali only D s
- October 2024, Unit 6, Q1(a)(iii) (2 marks): Give the formulae of the three ions present in Q and hence the formula of compound Q. (2) Ions in Q Formula of Q
- June 2024, Unit 5, Q16(a) (2 marks): Complete the equation for the reaction of a laboratory reagent with aqueous Fe3+ ions to produce a precipitate. Include state symbols in your answer. (2) [Fe(H2
- June 2024, Unit 6, Q2(a)(i) (2 marks): Complete the table giving the observations you would see. (2) Observation on adding a few Observation on adding an drops of sodium hydroxide excess of sodium hy
- June 2024, Unit 6, Q2(a)(ii) (1 mark): State what you can deduce about the nature of chromium(III) hydroxide from the results of Experiment 1. (1)
- January 2024, Unit 5, Q5(c) (1 mark): Aqueous solution X contains (1) A H2SO4 B KI C NaOH D NH3
- January 2024, Unit 6, Q1(a)(i) (1 mark): Dilute aqueous A pale blue precipitate The cation in A is (1) ammonia was added formed which drop‑by‑drop to 4 cm3 dissolved to give a of A until there was no d
- January 2024, Unit 6, Q1(a)(ii) (2 marks): Dilute aqueous A white precipitate The formula of the (2) ammonia was added formed with the first white precipitate is drop‑by‑drop to 4 cm3 few drops of B unti
- January 2024, Unit 6, Q1(a)(iii) (2 marks): Dilute aqueous (2) sodium hydroxide was added drop‑by‑drop to 4 cm3 of C until there was no further change
- January 2024, Unit 6, Q1(a)(iv) (1 mark): Dilute aqueous An off‑white precipitate sodium hydroxide was formed which did not added drop‑by‑drop to dissolve in excess but 4 cm3 of D until there darkened w
- January 2024, Unit 6, Q1(a)(v) (1 mark): Name the type of reaction which results in the darkening of the off‑white precipitate in (a)(iv). (1)
- October 2023, Unit 5, Q4 (1 mark): Aqueous sodium hydroxide and aqueous ammonia are added, until they are in excess, to separate portions of a pale green aqueous solution E. Test Observations Gre
- October 2023, Unit 5, Q5 (1 mark): A small amount of aqueous ammonia is added to an aqueous solution containing zinc ions. A white precipitate forms. Which is the equation for this reaction? A [Z
- June 2023, Unit 5, Q13 (1 mark): Which equation shows the formation of a precipitate? A [Zn(OH)4]2– + 2H3O+ → [Zn(H2O)4(OH)2] B [Zn(H2O)6]2+ + 4OH– → [Zn(OH)4]2– + 6H2O C [Cr(H2O)3(OH)3] + 3H3O
- June 2023, Unit 6, Q1(a)(i) (1 mark): A few drops of aqueous Chromium(III) ions (1) sodium hydroxide were may be present in P added to 5 cm3 of P
- June 2023, Unit 6, Q1(a)(ii) (1 mark): More sodium hydroxide Chromium(III) ions (1) solution was added are confirmed to be to the mixture from present in P (a)(i) until there was no further change
- June 2023, Unit 6, Q1(c)(i) (2 marks): The addition of dilute aqueous ammonia to a sample of solution Q produced a green precipitate which changed colour on standing. Explain why the colour change le
- January 2023, Unit 5, Q4 (1 mark): Which metal hydroxide precipitate is soluble in both excess aqueous ammonia and excess aqueous sodium hydroxide? A Cu(OH)2 B Fe(OH)2 C Ni(OH)2 D Zn(OH)2
- January 2023, Unit 6, Q1(a) (2 marks): Give the formulae of three cations which could be responsible for the green colour. (2)
- January 2023, Unit 6, Q1(b)(i) (1 mark): Give the formula of the green precipitate from solution A. (1)
- January 2023, Unit 6, Q1(b)(ii) (1 mark): Give the formula of the species responsible for the dark green colour in solution C. (1)
- October 2022, Unit 6, Q1(a)(iv) (1 mark): Add a small A blue precipitate forms The type of reaction amount of that takes place with the dilute aqueous complex ion during this ammonia precipitation is
- October 2022, Unit 6, Q1(a)(v) (3 marks): dilute aqueous ion formed is ammonia to the precipitate formed in (iv), until no further change is seen
- June 2022, Unit 5, Q13 (6 marks): *13 Compare and contrast the reactions in aqueous solution of nickel(II) sulfate with sodium hydroxide and with ammonia. For each reaction include • what would
- June 2022, Unit 5, Q17(b) (4 marks): After the copper(I) thiocyanate is precipitated, Zn2+ ions remain in solution. A student suggested that these Zn2+ ions can be precipitated by adding a large ex
- June 2022, Unit 6, Q1(a)(i) (2 marks): Identify, by name or formula, the salt in A. (2)
- January 2022, Unit 5, Q14 (6 marks): *14 Describe the reactions of separate samples of aqueous cobalt(II) sulfate with aqueous sodium hydroxide, excess aqueous ammonia and concentrated hydrochloric
- January 2022, Unit 6, Q1(b) (1 mark): Give the formula of precipitate B. (1)
- October 2021, Unit 5, Q6 (1 mark): Aqueous ammonia is added drop by drop to a solution of cobalt(II) chloride, CoCl2(aq), until in excess. What would be the sequence of observations? A blue solut
- October 2021, Unit 5, Q18(f) (2 marks): Complete the table, using as appropriate, to identify the type of each reaction. (2) Neutralisation Ligand exchange Redox Reaction 2 Reaction 3
- October 2021, Unit 6, Q1(a)(i) (1 mark): Test 1 A few drops of aqueous sodium hydroxide were added to a sample of the copper(II) sulfate solution. State what you would see. (1)
- June 2021, Unit 5, Q7 (1 mark): Aqueous sodium hydroxide was added to aqueous iron(II) sulfate and the mixture allowed to stand. What would be observed? Observations Immediately after adding A
- June 2021, Unit 5, Q8 (1 mark): When aqueous ammonia is added to an aqueous solution of zinc sulfate, a white precipitate forms which dissolves in excess ammonia to give a colourless solution.
- June 2021, Unit 6, Q1(b)(iii) (1 mark): Describe what would be observed on the addition of aqueous sodium hydroxide to solution T. (1)
- January 2021, Unit 5, Q19(a) (7 marks): Identify, by name (including the oxidation state) or formula, the species in the sequence that contain copper. (7) P Q R S T V W
- January 2021, Unit 6, Q1(b)(vi) (2 marks): A concentrated solution of ammonia is added to B. Initially a pale blue precipitate forms. When more ammonia is added, the precipitate dissolves forming a dark
- October 2020, Unit 5, Q24(a)(i) (2 marks): Complete the equation for Reaction 1. State symbols are not required. (2) [Fe(H2O)6]3+ + ……………….. NH3 →
- October 2020, Unit 6, Q1(a)(i) (2 marks): B dissolved in excess ammonia to form a deep blue solution containing a complex ion D. Identify, by name or formula, B and D. (2) Precipitate B Complex ion D
- October 2020, Unit 6, Q1(a)(ii) (1 mark): When another portion of B was heated gently, the solid turned black. Suggest the name or formula of the black solid. (1)
- October 2020, Unit 6, Q1(c) (1 mark): Give the name or formula of compound A. (1)
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