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Year 2 chemistry > 6.3.1 Chromatography and qualitative analysis > Flashcards

6.3.1 Chromatography and qualitative analysis Flashcards

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1
Q

How to carry out TLC

A

Take a sheet/plate of glass, plastic or metal.

Coat it with a thin layer of silica gel or alumina.

Draw a pencil line near to the bottom.

Place a small drop of the sample on this line.

Place the plate in a beaker containing solvent, but not enough to reach the pencil line.

Cover the beaker.

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2
Q

what TLC what is the mobile phase

A

liquid
eg-solvent

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3
Q

in TLC what is the stationary phase

A

soild
eg-silica gel/alumina

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4
Q

what are 2 factors affecting the movement up the plate

A
  1. retention by stationary phase
  2. solubility in solvent
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5
Q

what is Rf value

A

Rf value=distance moved by solute/distance moved by solvent

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Year 2 chemistry (18 decks)

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