Electrochemical cells and cell diagramsEdexcel A-Level Chemistry: Mind map

Exam questions on Electrochemical cells and cell diagrams

1. A teacher builds a cell from a zinc half-cell and a copper half-cell. Each metal strip dips into a 1.00 mol dm⁻³ solution of its own ions at 298 K, the two solutions are joined by a salt bridge, and a high-resistance voltmeter connects the metals. Standard electrode potentials: Zn²⁺(aq) + 2e⁻ ⇌ Zn(s), E° = −0.76 V; Cu²⁺(aq) + 2e⁻ ⇌ Cu(s), E° = +0.34 V.
   Explain the function of the salt bridge in this cell.2 marks
2. A student investigates a cell made from an Fe³⁺(aq)/Fe²⁺(aq) half-cell and an Ag⁺(aq)/Ag(s) half-cell. Standard electrode potentials: Fe³⁺(aq) + e⁻ ⇌ Fe²⁺(aq), E° = +0.77 V; Ag⁺(aq) + e⁻ ⇌ Ag(s), E° = +0.80 V.
   Write the conventional cell diagram for this cell, including state symbols.2 marks
3. A student wants to measure the standard electrode potential of the Cu²⁺(aq)/Cu(s) half-cell by connecting it to a standard hydrogen electrode (SHE).
   Describe the standard hydrogen electrode, including the conditions needed.3 marks