Fill half of a test tube with water and add sufficient crystals of sodium thiosulphate in it. Heat it gently until all the crystals of sodium thiosulphate has dissolved. Cool this tube without shaking. You will see that no crystals will appear in it even if it is sufficiently cooled. This is a super saturated solution.
To know whether the above solution is super saturated or not add a crystal of sodium thiosulphate in it. As the crystal is added, a large number of crystals of sodium thiosulphate will appear going down towards the bottom of the test tube. Within few minutes the whole test tube will be full of sodium thiosulphate crystals and very small amount of solution will be left in the test tube.
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