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Sodium silicate solution (water glass) will precipitate coloured metal silicates that appear to grow like underwater plants.
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Brief risk assessment guidance and experimental notes for a range of activities involving barium nitrate(V) and barium peroxide (Hazcard 11).
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A microscale method of showing preciptation reactions.
For more about this method see the video below which goes with this sheet.
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Halogenoalkanes contain polar covalent carbon-halogen bonds and undergo nucleophilic substitution reactions. This small-scale activity can be used to investigate the hydrolysis reaction of various hal..
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Although both aldehydes and ketones contain the carbonyl functional group (-C=O), only aldehydes give a positive test (formation of an orange to brick-red precipitate of copper(I) oxide) with Fehling’..
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Risk assessment information for ammonium sulfide, potassium sulfide and sodium sulfide salts and solutions.
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Common anions are tested on a plastic covered worksheet, for quick easy disposal. Using solutions with minimum concentrations allows closer observations and initiates talking points. Students can phot..
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A small amount of sodium is added to concentrated hydrochloric acid. There is fizzing and a precipitate of sodium chloride forms but no explosion. If potassium is used there is ignition but again, no ..
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This video shows a new microscale method for pupils to discover and try out different precipitate reactions.
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The common negative ions, carbonate (CO32-),
sulfate(VI) (SO42-) and the halides (Cl–, Br–
and I–) can be simply tested for in test tube reactions. The method
described here uses a more dilute ammo..
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