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PRACTICALS
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Study Plan for Practical Work
A nice demonstration to set up is a U-tube containing a copper(II) sulfate jelly. Details can be found in the Nuffield Fourth Edition Teachers' Guide. An alternative is to use copper(II) chromate where both ions are coloured.
Materials:
| 0.1M hydrochloric acid (10 cm3) | 0.1M sodium hydroxide (10 cm3) |
| 0.1M sodium chloride (10 cm3) | 0.1M magnesium sulphate (10 cm3) |
| 0.1M aluminium nitrate (10 cm3) | Potassium manganate(VII) |
| Low tension a.c./d.c. power supply | 2.5V/3.5V torch bulb and holder |
| Crocodile clips and leads | Electrolysis cells with graphite electrodes |
| Microscope slide | Filter paper strip |
| Forceps |