plumiStandard electrode potentials and the hydrogen electrode: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 16.1.1 Standard electrode potentials and the hydrogen electrode, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(b)
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All 16 questions on Standard electrode potentials and the hydrogen electrode, as a list
- June 2025 (A), Unit 5, Q1(b) (1 mark): The solution for the right‑hand half‑cell is prepared by adding suitable amounts of iron(II) sulfate and iron(III) sulfate to distilled water to make 1.00 dm3 o
- October 2024, Unit 5, Q17(a) (6 marks): Describe how you would carry out an experiment to determine the standard electrode potential of the electrode system shown. Co2+(aq) + 2e− Co(s) Assume that y
- June 2024, Unit 5, Q14(b)(i) (2 marks): Identify X and Y. (2) X: Y:
- January 2024, Unit 5, Q1(b) (1 mark): A student wishes to measure the standard cell potential, Ecell , of this cell. The right‑hand cell requires Cr3+ and Cr2+ ions. What mass of Cr2(SO4)3·18H2O mus
- October 2023, Unit 5, Q18(a) (5 marks): Draw a labelled diagram of the apparatus you would use to measure the standard electrode potential of a Cu2+(aq) | Cu(s) electrode with a standard hydrogen elec
- June 2023, Unit 5, Q21(d)(i) (1 mark): Suggest why KCl crystals are needed in the outer tube of the electrode. (1)
- June 2023, Unit 5, Q21(d)(iv) (3 marks): Add labels to complete the diagram of a standard hydrogen electrode. Include details of any essential conditions. (3) V salt bridge KNO3(aq)
- June 2023, Unit 5, Q21(d)(v) (1 mark): Suggest one advantage of using a calomel electrode, in place of a standard hydrogen electrode, when measuring a cell potential. (1)
- October 2022, Unit 5, Q2 (1 mark): What is the pressure of hydrogen gas used in the standard hydrogen electrode? A 1 Pa B 100 Pa C 1 000 Pa D 100 000 Pa Use this space for any rough working. Anyt
- October 2022, Unit 5, Q3(b) (1 mark): The reaction between Cr2O7 2− , Cr3+ electrode system is +1.33 V. The standard electrode potential for the Cr2O7 What is the standard electrode potential for th
- January 2022, Unit 5, Q3(b) (1 mark): The electrolyte in the right‑hand half‑cell is prepared using equal volumes of (1) A 1 mol dm−3 acidified VO2 +(aq) and 1 mol dm−3 acidified VO2+(aq) B 2 mol dm
- October 2021, Unit 5, Q1(b) (1 mark): Solution 1 is (1) A 0.33 mol dm–3 H3PO4(aq) B 0.50 mol dm–3 H2SO4(aq) C 1.00 mol dm–3 HCl(aq) D 1.00 mol dm–3 CH3COOH(aq)
- June 2021, Unit 5, Q2(c) (1 mark): The half-cell for the Fe3+/ Fe2+ electrode system is prepared by mixing equal volumes of solutions of iron(II) sulfate, FeSO4, and iron(III) sulfate, Fe2(SO4)3.
- January 2021, Unit 5, Q1 (1 mark): When an alkene is added to a solution of potassium manganate(VII), the purple solution turns colourless. In terms of electron transfer and oxidation number, how
- January 2021, Unit 5, Q2 (1 mark): The standard hydrogen electrode uses an electrode of platinum coated in a finely divided form of the metal called platinum black. What is the purpose of this co
- October 2020, Unit 5, Q21(a) (3 marks): The half-equation for an iron(III) / iron(II) half-cell is Fe3+(aq) + e− ⇌ Fe2+(aq) The standard electrode potential of this half-cell is measured using the app
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