The concentration unit used in determining freezing point depression and boiling point elevation is ________.
A)molality
B)mole fraction
C)normality
D)molarity
E)weight fraction

Question

Quizplus · Accepted Answer

Molality (moles of solute per 1 kg of solvent) is used in determining freezing point depression and boiling point elevation because it is independent of temperature and does not change with the addition of solvent or solute, making it a more accurate measure of concentration for these calculations. Molarity (moles of solute per liter of solution) and normality (equivalent moles of solute per liter of solution) are both dependent on volume, and weight fraction and mole fraction are not specific to the solvent-solute relationship.

The Concentration Unit Used in Determining Freezing Point Depression and Boiling