A suitable purification method for a substance which decomposes when heated to its boiling point is Evaporation.
Boiling is the vapourization of a liquid which occurs when heat is applied to a liquid for a period of time till it gets to it's boiling point.
Purification is a method used in the recovery of a chemical substance from it's solution or solvent.
Evaporation is the removal of volatile substance from non-volatile substance which are too small to be filtered out.
The suitable purification method that can be used to purify a substance which decomposes on heating in it's boiling point is Evaporation.
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