C2.1.7 - Purification And Checking Purity Flashcards

1
Q

What can you use to tell if a substance is pure?

A

Thin-layer chromatography or paper chromatography

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2
Q

What is better at checking pure substances between the two?

A

Thin Layer Chromatography

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3
Q

What are the advantages of using thin-layer chromatography over paper chromatography for checking pure substances?

A

It is quicker
I5 is more sensitive
There is a larger range of chemical phases to choose from
You can also scrape an individual spot for further analysis from a thin layer chromatogram using gas chromatography

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4
Q

What do you need to know about the substances in order to use the correct separation method?

A

The properties of the substances

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5
Q

How do you separate insoluble substances?

A

Dissolving followed by filtration

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6
Q

How do you separate solutions?

A

Crystallisation to obtain the solute

Simple distillation to obtain the solvent

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7
Q

How do you separate two or more substances in the liquid state?

A

Fractional distillation

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8
Q

How do you separate coloured soluble solitons?

A

Paper Chromatography or Thin-Layer Chromatography

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