A soluble volatile impurity is a substance that can dissolve in a liquid and easily evaporate at a relatively low temperature.
A soluble volatile impurity can lower the boiling point of a liquid by disrupting the intermolecular forces between the liquid molecules, making it easier for the liquid to change into a gas.
The more soluble volatile impurity present in a liquid, the greater the decrease in boiling point. This relationship is known as Raoult's law.
Yes, in some cases, a soluble volatile impurity can increase the boiling point of a liquid. This can happen when the impurity forms strong intermolecular bonds with the liquid molecules, making it more difficult for the liquid to change into a gas.
The effect of a soluble volatile impurity on boiling point can be measured by conducting a boiling point elevation experiment, where the boiling point of a pure liquid is compared to the boiling point of a solution containing the impurity.