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TGJ1:
Solubility
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Language Alert
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Some people use ‘solubility’ when talking
about how fast something dissolves. This is not using
the word with its proper scientific meaning. |
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Solubility is about how much dissolves
in a certain amount of solvent. |
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So far, we have just considered water, but we will consider
different solvents very shortly.
We have explained what dissolving is but not why there are
different solubilities. The particle theory can be developed
to explain why different substances have different solubilities,
but it involves some very advanced ideas. At the moment, we
are simply demonstrating that there are differences.
Notes on the ‘alum’ video
You may want to ask students why the rest of the crystals
are crushed up and re-dissolved (to put back what came
out of the saturated solution) and why the beaker had been
warmed (to prevent rapid cooling and crystals
forming too soon).
‘Think for Yourself’ question
Would this method work for salt?
No. The solubility of salt in water increases only very slightly
as the temperature of the water increases over this temperature
range.
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Science Enhancement Programme CD-ROM 2005 |
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user
guide |
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