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| R |
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| Reflux |
The heating
of a reaction (in a suitable solvent) in a flask fitted with a condenser
so that evaporated solvent is returned to the flask. |
| Residue |
The proportion
of material that remains in the boiling flask after a distillation
is completed. |
| Retention
Factor (Rf) |
A measurement
of how far a compound has moved up a thin layer chromatography plate.
It is calculated by dividing the distance the compound has moved by
the distance the solvent has moved and so has a value between 0 and
1. |
| 'Rotoflow'
Tap |
Often
fitted to separating and addition funnels and is made up of a plastic
tap which screws into a glass thread. The advantage of this kind of
tap is the added control of addition rate. |
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