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This experiment should be carried out in a fume cupboard to limit the release of sulfur dioxide. If the upper temperature is limited (use ice to obtain a couple of lower than room temperature values) and the lab is well-ventilated the experiment can be carried out in the open lab.
This is a simple experiment which gives good results and useful practice in data handling and graph drawing.
Materials:
| 0.1 M sodium thiosulfate (50 cm3) | 0.5 M hydrochloric acid (50 cm3) |
| 400 cm3 beaker | Boiling tubes (2) |
| Bunsen burner | Tripod |
| 10 cm3 measuring cylinder (2) | Sellotape⇒ |
| Heat-proof mat | Gauze |
| Test tube brush | Ice |
| -10 to 110ºC thermometer |