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6. Electrochemistry
A section of Chemistry, 9701
Listing 10 of 82 questions
The diagram shows the apparatus used to measure the standard electrode potential, E o, of Fe3+/ Fe2+. E F C A B V D Identify what the letters A to F represent. A D B E C F Label the diagram to show ● which is the positive electrode, ● the direction of electron flow in the external circuit. Use the Data Booklet to help you. In another experiment, an Fe3+/ Fe2+half-cell was connected to a Cu2+/ Cuhalf-cell. Determine the standard cell potential, , when these two half-cells are connected by a wire and the circuit is completed. Use the Data Booklet to help you. = V The E o of Ni2+/ Niis –0.25 V. State and explain how the electrode potential changes if the concentration of Ni2+is decreased. The E o of Cr3+/ Cr2+is –0.41 V. Calculate the electrode potential when [Cr3+] is 0.60 mol dm–3 and [Cr2+] is 0.15 mol dm–3. Use the Nernst equation. E = E o + 0.059 log [oxidised species] z [reduced species] E = V
9701_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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Questions Discovered
82