Edexcel IAL Chemistry A2 16.5 measuring electrode potentials
Edexcel IAL Chemistry A2 16.5 measuring electrode potentials
Decide whether the half-cell needs a metal electrode or inert platinum, then choose soluble salts, 1 mol dm-3 solutions and a nitrate salt bridge.
How this is tested
- Choose metal electrodes for metal half-cells and platinum for ion-only systems.
- Identify KNO3 salt bridges and 1 mol dm-3 Fe2+/Fe3+ or other soluble ion solutions.
- Explain that salt bridges allow ion flow while wires carry electrons only.