How do impurities affect melting point?
Keeping this in consideration, how does impurity affect melting point?
Impurities present in a solid organic compound tend to have 2 effects on the melting point. First, they tend to lower the overall melting point of the compound versus the value for pure material. Impure compounds tend to melt more slowly over a larger range of temperature values.
Keeping this in view, how do impurities affect melting point and boiling point?
Impurities in solids typically lower the melting point because they disrupt the pristine crystal lattice. Adding impurities to a liquid typically raises the boiling point because of increased solution phase entropy. Or you can think of the impurity as lowering the vapor pressure of the liquid.
Adding impurities to a solution, in most cases, increases the boiling point of the solution. This occurs because the presence of impurities decreases the number of water molecules available to become vaporized during boiling.