All Resource articles – Page 49

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Titration

The addition of one reagent (the titrant) from a burette to another reagent until an end-point is reached is known as a titration. These have to be done with great care and precision to establish reliable and accurate results. Video: Titration video
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Cooling mixtures

Cooling baths are very useful in chemistry labs to control exotherimc reactions. In this resource we share various recipes for making cooling baths to temperatures below 0°C. There are many instances where you will need cooling as part of the procedure, for example in recrystallisation, carrying out reactions at low ...
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Distillation

Distillation separates liquids on the basis of them having different boiling points. Video: Distillation video
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Solvent extraction

2016-06-16T11:32:00Z

This technique uses two solvents which are immiscible, for example an organic solvent such as diethyl ether can be used to extract an organic compound from an aqueous solution leaving water soluble impurities behind. A variation of this is acid - base extraction where acidic or basic compounds are extracted ...
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Recrystallisation

Recrystallisation is a means of purifying solids. If carried out correctly the final product will be both of a high yield as well as pure. Video: Recrystallisation video
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Vacuum filtration

When a solid needs to be isolated from a solution it is normally done at a reduced pressure using a Buchner flask and Buchner funnel. Video: Vacuum filtration video
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Standard solution

A standard solution is a a solution of accurately known concentration prepared from a primary standard (a compound which is stable, of high purity, highly soluble in water and of a high molar mass to allow for accurate weighing) that is weighed accurately and made up to a fixed volume. ...
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Soxhlet extraction

When a compound of low solubility needs to be extracted from a solid mixture a Soxhlet extraction can be carried out. The technique places a specialised piece of glassware in-between a flask and a condenser. The refluxing solvent repeatedly washes the solid extracting the desired compound into the flask. ...
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Mission starlight

The mission? To protect astronauts from the effects of harmful UV light
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Space: science ideas webs

A web of suggested ideas for linking science with the topic space. You can learn history and science together with activities for different age groups.
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The Victorians: science ideas webs

A web of suggested ideas for linking science with the topic the Victorians. You can learn history and science together with activities for different age groups.
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The Stone Age: science ideas webs

A web of suggested ideas for linking science with the topic the stone age. You can learn history and science together with activities for different age groups.
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Maya and Aztecs: science ideas webs

A web of suggested ideas for linking science with the topic the Maya and Aztecs. You can learn history and science together with activities for different age groups.
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The Romans: science ideas webs

A web of suggested ideas for linking science with the topic the Romans. You can learn history and science together with activities for different age groups.
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Ancient Egypt: science ideas webs

A web of suggested ideas for linking science with the topic Ancient Egypt. You can learn history and science together with activities for different age groups.
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The Tudors: science ideas webs

A web of suggested ideas for linking science with the topic the Tudors. You can learn history and science together with activities for different age groups.
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The Vikings: science ideas webs

A web of suggested ideas for linking science with the topic the Vikings. You can learn history and science together with activities for different age groups.
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The golden age of Islamic science: science ideas webs

A web of suggested ideas for linking science with the topic the golden age of Islamic science. You can learn history and science together with activities for different age groups.
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World War II: science ideas webs

A web of suggested ideas for linking science with the topic World War II. You can learn history and science together with activities for different age groups.
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Ancient Greece: science ideas webs

A web of suggested ideas for linking science with the topic the Ancient Greece. You can learn history and science together with activities for different age groups.