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PRACTICALS
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Study Plan for Practical Work
This is a good practice for the preparation practical assessment with an introduction to some useful new techniques. I find that students are more enthusiastic with a little competition, so I always tell them in advance that I shall grade their product in terms of yield, dryness and purity.
You need to keep an eye out for solid iodine. It has a habit of being spilt onto bench surfaces with consequent transfer to skin and clothing.
Materials:
| Iodine solid (5 g) | 4M potassium hydroxide solution (10 cm3) |
| 0.1M sodium thiosulphate (for stains) | Ice bath |
| Boiling tube | Glass rod |
| Spatula | 400 cm3 beaker |
| 100 cm3 beaker | Bunsen burner |
| Tripod and gauze | Buchner flask and funnel |
| Filter paper | Desiccator |
| Dropping pipette | 10 cm3 measuring cylinder |
| Vacuum line or water pumps | Vacuum tubing |
| Balance reading to at least ± 0.1 g | Sample bottle |