The solubility of solids
changes with temperature, and you can plot this on a solubility curve.
For
example, in this solubility curve, typical solid results are shown, and
solubility increases as temperature increases. From the graph we can see that
in 100g of water, if the temperature were at 800C, a mass of 160g of
potassium nitrate (KNO3) would dissolve.
Furthermore, if one were to
take a solution containing 160g of potassium nitrate in 100g of water, and
allowed it to cool down to 25oC (only 40g can dissolve), 120g of
potassium nitrate must be released from the solution, which it does as
crystals- it crystallises out of the solution.
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