How much do impurities lower the melting point?

Answer by  apsaras (408)

Impurities lower the melting point of a substance by disrupting the internal bonding of its molecules. The extent of the melting point lowering increases with the concentration of impurities and the cryoscopic (or freezing point depression) constant of the substance. The amount of melting point lowering can range from a fraction of a degree to several degrees Celsius.

Answer by  GopikaVarma (26)

Depending on the nature of impurity it can affect the melting point of a substance.Impurities tends to lower the melting melting of a substance depends on the concentration of impurity.