IB Chemistry 3.2.13 (HL) Standard cell potential (E⦵cell) Questions
IB Chemistry 3.2.13 (HL) Standard cell potential (E⦵cell) Questions
Build confidence with E°cell questions by selecting the correct half-cells, subtracting E° values properly and judging spontaneity from the sign.
How this is tested
- calculate E°cell with E°cell = E°cathode - E°anode, e.g. +0.34 - (-0.76) = +1.10 V
- identify which half-cell is cathode or anode before calculating E°cell for pairs like Al/Al^3+ and Ni/Ni^2+
- use the sign of E°cell to predict spontaneity, and reject answers with the right value but wrong sign