ISSR CLASSES
Checkpoint Science
iGCSE Chemistry
iGCSE Physics
iGCSE Coordinated Science
A-Level Chemistry
PRACTICALS
Practicals Home
Practicals A-Z
Study Plan for Practical Work
This is a good experiment to introduce some simple Quickfit and the technique of distillation. Apparatus needs to be carefully checked to avoid glass bends hanging on by the grease (we use plastic clips) and some very imaginative, but not very effective, clamping.
It is useful to point out how the separation depends on the boiling points of the various materials and that vigorous boiling will cause the higher boiling point components to splash over. Boiling point of propanal = 76 ºC, sulfuric acid = 338 ºC.
Materials:
| 1M sulfuric acid (10 cm3) | Sodium dichromate(VI) (3 g) |
| Anti-bumping granules | Propan-1-ol (1.5 cm3) |
| Benedict's solution (5 cm3) | 1M sodium carbonate (5 cm3) |
| 50 cm3 pear-shaped flask | 10 cm3 measuring cylinder |
| Tripod and gauze | Bunsen burner |
| Funnel | Expansion adapter |
| Heat-proof mat | Stopper |
| Powder funnel | Still head |
| Glass bend | Joint clip |
| Test tubes (2) | Test tube rack |
| Laboratory jack or alternative | Dropping pipette |
| Top pan balance reading to the nearest ± 0.1 g | Disposable gloves |