Question

x.
While considering boiling point
elevation and freezing point depression
a solution concentration is expressed in
molality and not in molarity. Why?​

Answer 1

Answer:

Solution. ... We cannot express the concentration of the solution in molarity because it changes with temperature whereas molality is temperature independent. Hence, while considering boiling point elevation and freezing point depression a solution concentration is expressed in molality and not in molarity.

Answer 2

Answer:

molarity = number of moles of solute ÷ volume of solution

molality = number of mole of solute ÷ weight of solution

as shown above molarity depend on volume which changes as change in temperature, therefore molarity will change with change in temperature , where as molality remains independent of temperature

therefore molality is taken in consideration for calculating boiling point elevation or freezing point depression