DP Chemistry (last assessment 2024)
Question 22N.2.hl.TZ0.f.iii
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.2.hl.TZ0.f.iii |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | f.iii | Adapted from | N/A |
f.iii.
[Maximum mark: 1]
22N.2.hl.TZ0.f.iii
Consider the following reaction:
Cu2+ (aq) + Fe (s) → Fe2+ (aq) + Cu (s)
The diagram shows an unlabelled voltaic cell for the reaction:
Cu2+ (aq) + Fe (s) → Fe2+ (aq) + Cu (s)
The diagram includes a salt bridge that is filled with a saturated solution of KNO3. Outline the function of the salt bridge.
[1]
Markscheme
«keep» each half-cell/electrolyte «electrically» neutral ✔
Accept balance charges/ions.
Accept allow ion flow «between cells».
Examiners report
Most students were aware of the role of the salt bridge, even if only as completing the circuit.
