| C |
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| Calibration
(Thermometers) |
To ensure
accurate temperature readings (for example when measuring melting
points) thermometers are often calibrated by measurement of melting
points of pure compounds. A graph of measured melting points against
actual ones.can then be used to correct the thermometer. |
| Capillary
(Tubes) |
Thin walled
tubes of a small diameter. These can be sealed at one end for use
in melting point determinations or they can be 'drawn out' to make
micropipettes for spotting TLC plates. |
| Chromophore |
A group
which will absorb radiation in the visible or UV spectrum. Compounds
containing chromophores can be visualised on developed TLC plates
under UV light providing the plate has been pre-treated with a suitable
fluorescing agent. |
| Clear |
A liquid
that is free of any solids or suspended material. A clear solution
may be coloured. |
| Colourless |
Any
material that has no colour (as opposed to white). |
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