How do impurities lower the melting point of a pure substance?

1 Answer
Jan 17, 2018

Looking into Colligative Properties might be helpful


In a nutshell, there are stronger attractions between different molecules of the substance than between the substance and its impurities. Therefore, the impurities reduce the strength with which the substance is held together, so less extra energy (heat) must be added to get the substance to melt.