All Analysis articles – Page 6
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ResourceTesting the hardness of water
Soap solution is used to measure the hardness of rain water, temporarily hard water and sea-water. The effect of boiling the hard water samples is investigated.
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Unsaturation in fats and oils
Food labels and advertisements often refer to unsaturated fats and oils. A comparison of the amounts of unsaturated fats and oils present in different foodstuffs can be made by titrating solutions of samples with aqueous bromine (bromine water), which reacts with the carbon - carbon double bonds present in such fats and oils.
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News
Purely inorganic aromatic ion synthesised
Aromatic anion made from nitrogen and phosphorus synthesised
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Resource
Chromatography of sweets
In this experiment you will remove the dye from the surface of various Smarties® or M&M’S®. Chromatography will then show all the different substances used to produce each colour for the sweets.
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Silver and lead halides
Insoluble silver and lead halides form as precipitates when solutions of silver of lead salts are added to solutions containing halide ions.
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Problem based practical activities
A collection of 10 practical activities where students apply their understanding of a concept to devise a solution to a ‘real-life’ scenario.
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Feature
The impossible water sensor
Hundreds of different chemicals can ruin our water, so measuring their levels is vital. Josh Howgego investigates whether building sensors that can do the job cheaply and remotely will ever be possible
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Soundbite
Dual personality of light caught on camera
Is it a wave or is it a particle? We might know the answer, (Spoiler alert: it’s both!) but it is reassuring nonetheless to see the pictures that prove it, says Nina Notman
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Resource
Plastics conservation - Barbie and friends
This resource provides the essential knowledge needed to keep plastic pieces in the best possible condition so that they can continue to be enjoyed for many years.
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Which sodium salt is which?
Using laboratory tests identify sodium sulphate, sodium sulphite, sodium thiosulphate, sodium metabisulphite and sodium persulphate.
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Which gas is which?
In the beaker are test-tubes containing different gases - carbon dioxide, dinitrogen oxide, oxygen, chlorine and hydrogen. You may remove a test-tube only once and when you do so you must identify the gas immediately.
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Vintage titrations: tannin in wine
Determine the tannin concentration in the samples of wine and investigate the differences between red and white wine.
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Vintage titrations: sulfur dioxide concentrations in wine
Devise an analytical method to compare the amount of sulphur dioxide present in the samples of wine provided.
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Three isomeric alcohols
Identify three different alcohols which each have the formula C 4 H 10 O using standard laboratory tests.
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Only dust - is there a sign of life?
Determine whether the sample of dust originates from a living source or a non-living source and design a test for the dust sample that exploits a physical property of organic molecules from living sources, using only the equipment provided.
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Feature
Identifying extraterrestrial materials
Meteorites can be bought cheaply online and offer an excellent laboratory teaching tool, explain Luis Lahuerta Zamora, Salvador Lahuerta Zamora and Ana Mellado Romero
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Resource
Ri Christmas Lectures® 2012: Group 1 Flame Tests
A teaching resource on the group 1 flame tests, supported by video clips based around the Royal Institution 2012 Christmas Lectures ® Video: Group 1 flame tests Video: Lithium flame test Video: Sodium Flame ...
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Feature
Good chemistry
There are all sorts of ways chemists can use their skills to aid global development, writes Josh Howgego
