Aqueous zinc nitrate solution is electrolysed using inert electrodes. The gases are collected in gas syringes. Assume that none of either gas dissolves.
Name the gas formed at each electrode.
A reference experiment was also carried out using aqueous zinc nitrate solution and inert electrodes. The volumes of gas collected were:
| Electrode | Volume collected (cm3\mathrm{cm^{3}}cm3) |
|---|---|
| Cathode | 54 |
| Anode | 27 |
The gas syringe readings for another electrolysis of aqueous zinc nitrate solution are shown in the table.
| Gas syringe | Initial reading (cm3\mathrm{cm^{3}}cm3) | Final reading (cm3\mathrm{cm^{3}}cm3) |
|---|---|---|
| Cathode | 16 | 94 |
| Anode | 11 | ? |
Calculate the final reading of the gas syringe at the anode.
Show your working.
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.