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Both these methods can give good results. It is worth spending enough time to ensure that students fully understand the methods before starting the experiments. Method 1 has quite a lot of instructions and it is not uncommon for some of them to be ignored!
Materials (method 1):
| 0.02 M iodine in KI (50 cm3) | 1 M propanone (25 cm3) |
| 1 M sulfuric acid (25 cm3) | 0.5 M sodium hydrogencarbonate (50 cm3) |
| 0.010 M sodium thiosulfate (200 cm3) | Starch indicator |
| 250 cm3 conical flasks (2) | 100 cm3 conical flasks (2) |
| 50 cm3 burette | 10 cm3 pipette |
| 50 cm3 measuring cylinder | Funnel |
| White tile | Pipette filler |
| Stop clock |
Materials (method 2):
| 0.01 M iodine in KI (15 cm3) | 2 M propanone (30 cm3) |
| 2 M hydrochloric acid (75 cm3) | |
| Test tubes (4) | 100 cm3 conical flasks (4) |
| 50 cm3 burette (3) | White tile |
| Stop clock |